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Kg (Germany) | First Lien Delayed Draw Term Loan | Quarterly LIBOR | Floor Rate 1.00% | Spread 8.00% Cash and 3.00% PIK | Total Coupon 15.73% | Maturity 11/23/20252022-12-310001326003Debt Investments | Construction & Engineering | Vortex Companies, LLC | First Lien Delayed Draw Term Loan | Monthly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.32% | Maturity 9/4/20292023-09-300001326003Debt Investments | Internet Software & Services | Suited Connector, LLC | First Lien Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 6.00% Cash + 2.00% PIK | Total Coupon 13.36% | Maturity 12/1/20272023-09-300001326003Debt Investments | Diversified Financial Services | Callodine Commercial Finance, LLC | Subordinated Debt | Monthly SOFR | Floor Rate 0.25% | Spread 8.50% | Total Coupon 13.14% | Maturity 10/8/20272022-12-310001326003srt:MaximumMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Unsecured Debt2023-09-300001326003Debt Investments | Software | Oversight Systems, Inc. | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 7.75% | Total Coupon 13.22% | Maturity 9/24/20262023-09-300001326003Debt Investments | Construction & Engineering | LJ Avalon Holdings, LLC (Ardurra) | First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.79% | Maturity 2/1/20302023-09-300001326003Equity Securities | Oil, Gas & Consumable Fuels | TER Management Resources, LLC (fka ETX Energy Management Company, LLC) | Limited Partnership/Limited Liability Company Interests2022-12-310001326003us-gaap:GeographicConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-3000013260032022-06-300001326003Debt Investments | Internet Software & Services | Sailpoint Technologies Holdings, Inc. | First Lien Revolver | SOFR(M) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.58% | Maturity 8/16/20282022-12-310001326003Debt Investments | Machinery Sonnys Enterprises, LLC | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 10.99% | Maturity 8/5/20262022-12-310001326003Debt Investments | Software | Superman Holdings, LLC (Foundation Software) | First Lien Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 6.13% | Total Coupon 11.52% | Maturity 8/31/20262023-09-300001326003bkcc:BankDebtMember2023-06-300001326003Debt Investments | Health Care Technology | CareATC, Inc. | First Lien Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 7.25% | Total Coupon 13.26% | Maturity 3/14/20242023-09-300001326003Investment MXP Prime Platform GmbH (SellerX) (Germany) | Warrants to Purchase Preferred Series B Shares | Initial Acquisition Date 11/23/20212022-01-012022-12-310001326003Equity Securities | Capital Markets | Marico Holdings, LLC | Limited Partnership/Limited Liability Company Interests2022-12-310001326003Debt Investments | Insurance | IT Parent, LLC (Insurance Technologies) | First Lien Term Loan | LIBOR(M) | Floor rate 1.00% | Spread 6.25% | Total Coupon 10.63% | Maturity 10/1/20262022-12-310001326003Equity Securities2022-12-310001326003Debt Investments | Software | Zilliant Incorporated | First Lien Term Loan | LIBOR(M) | Floor Rate 0.75% | Spread 2.00% Cash + 4.50% PIK | Total Coupon 10.85% | Maturity 12/21/20272022-12-310001326003bkcc:CapitalMarketsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Software | Elastic Path Software Inc. (Canada) | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.50% | Total Coupon 12.12% | Maturity 1/6/20262022-12-310001326003Debt Investments | Internet Software & Services | InMoment, Inc. | First Lien Term Loan | SOFR(S) | Floor Rate 0.75% | Spread 5.00% cash+ 2.50% PIK | Total Coupon 12.34% | Maturity 6/8/20282023-09-300001326003us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2021-12-310001326003bkcc:IndustryConcentrationRiskMemberbkcc:HealthCareEquipmentAndSuppliesMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-06-090001326003srt:MaximumMember2023-09-300001326003Debt Investments | Diversified Financial Services | Libra Solutions Intermediate Holdco, LLC et al (fka Oasis Financial, LLC) | Second Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 8.50% | Total Coupon 13.94% | Maturity 7/5/20262023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class B Preferred Stock2023-09-300001326003us-gaap:IncomeApproachValuationTechniqueMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberbkcc:TrancheTwoMember2022-06-092022-06-090001326003us-gaap:EquitySecuritiesMember2022-06-300001326003Equity Securities | Trading Companies & Distributors | Blackbird Holdco, Inc. (Ohio Transmission Corp.) | Preferred Stock | Total Coupon 12.50% PIK2022-12-310001326003bkcc:HotelsRestaurantsAndLeisureMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Health Care Technology | ESO Solutions, Inc. | First Lien Revolver | SOFR(Q) | Floor rate 1.00% | Spread 7.00% | Total Coupon 11.59% | Maturity 5/3/20272022-12-310001326003Controlled Affiliated Investments2023-09-300001326003Investment FinancialForce.com | Warrants to Purchase Series C Preferred Stock | Initial Acquisition Date 1/30/20192022-01-012022-12-310001326003bkcc:IndustryConcentrationRiskMemberbkcc:SpecialtyRetailMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Health Care Providers & Services | Opco Borrower, LLC (Giving Home Health Care) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.18% | Maturity 8/19/20272022-12-310001326003us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003us-gaap:CommonStockMember2023-07-012023-09-300001326003us-gaap:ForeignExchangeForwardMember2022-12-310001326003Debt Investments | Professional Services | TLE Holdings, LLC | First Lien Term Loan | LIBOR(M) | Floor Rate 1.00% | Spread 5.50% | Total Coupon 9.88% | Maturity 6/28/20242022-12-310001326003Debt Investments | Semiconductors & Semiconductor Equipment| Emerald Technologies (U.S.) AcquisitionCo, Inc | First Lien Revolver| Monthly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.43% | Maturity 12/29/20262023-09-300001326003Equity Securities | Diversified Financial Services | Gordon Brothers Finance Company | Common Stock2022-12-310001326003bkcc:SeniorSecuredNotesMember2022-12-310001326003Equity Securities | Oil, Gas & Consumable Fuels2023-09-300001326003us-gaap:OtherDebtSecuritiesMember2022-01-012022-09-300001326003Debt Investments | Media | Streamland Media Midco LLC | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 11.11% | Maturity 8/31/20232022-12-310001326003Debt Investments | Diversified Financial Services | Accordion Partners LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.64% | Maturity 8/29/20292023-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacilityMembersrt:MaximumMember2022-12-310001326003srt:MaximumMember2020-05-020001326003srt:MinimumMemberbkcc:PreIncentiveFeeNetInvestmentIncomeBetweenOnePointSevenFiveAndTwoPointOneTwoPercentageOfNetAssetsMember2020-05-022020-05-020001326003Debt Investments | Internet Software & Services | Spartan Bidco Pty Ltd (StarRez) (Australia) | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 0.75% cash + 6.25% PIK | Total Coupon 12.50% | Maturity 1/24/20282023-09-300001326003bkcc:OilGasAndConsumableFuelsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Health Care Technology2022-12-310001326003Debt Investments | Diversified Financial Services | Libra Solutions Intermediate Holdco, LLC et al (fka Oasis Financial, LLC) | Second Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 18.50% | Total Coupon 12.93% | Maturity 7/5/20262022-12-310001326003Debt Investments | Hotels, Restaurants & Leisure2023-09-300001326003Equity Securities | Diversified Financial Services | Gordon Brothers Finance Company | Preferred Stock | Total Coupon 13.50%2022-12-310001326003us-gaap:TreasuryStockCommonMember2023-01-012023-03-310001326003Debt Investments | Software | SEP Raptor Acquisition, Inc. (Loopio) (Canada) | First Lien Term Loan | LIBOR(Q) | Floor Rate 1.00% | Spread 4.50% Cash + 3.00% PIK | Total Coupon 12.25% | Maturity 3/31/20272022-12-310001326003Debt Investments | Internet & Catalog Retail2022-12-310001326003Debt Investments | Consumer Finance | Freedom Financial Network Funding, LLC | First Lien Term Loan | Semiannually SOFR | Floor Rate 1.00% | Spread 9.00% | Total Coupon 13.95% | Maturity 9/21/20272022-12-310001326003Debt Investments | Health Care Technology | Appriss Health, LLC (PatientPing) | First Lien Revolver | SOFR(Q) | Floor rate 1.00% | Spread 7.25% | Total Coupon 12.23% | Maturity 5/6/20272023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:InternetAndCatalogRetailMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003us-gaap:AdditionalPaidInCapitalMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2021-12-310001326003Debt Investments | Commercial Services & Supplies | Kellermeyer Bergensons Services, LLC | First Lien Delayed Draw Term Loan A | Quarterly LIBOR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.41% | Maturity 11/7/20262022-12-310001326003Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Senior Secured Loan, First Lien2021-12-310001326003bkcc:ReimbursementExpensesMember2022-01-012022-09-300001326003bkcc:AutomobilesSectorMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Software | Fusion Risk Management, Inc. | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 3.50% Cash + 4.00% PIK | Total Coupon 12.88% | Maturity 5/22/20292023-09-300001326003bkcc:NonControlledAffiliatedInvestmentsMember2023-07-012023-09-300001326003Debt Investments | Software | JOBVITE, Inc. (Employ, Inc.) | First Lien Term Loan | SOFR(S) | Floor Rate 0.75% | Spread 8.00% | Total Coupon 10.93% | Maturity 8/5/20282022-12-310001326003srt:MaximumMembersrt:DirectorMember2022-10-280001326003Debt Investments | Construction & Engineering | LJ Avalon Holdings, LLC (Ardurra) | First Lien Revolver | Quarterly SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.77% | Maturity 2/1/20292023-09-300001326003Debt Investments | Software | Bonterra LLC (fka CyberGrants Holdings, LLC) | First Lien Delayed Draw Term Loan | LIBOR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.98% | Maturity 9/8/20272022-12-310001326003us-gaap:MeasurementInputRevenueMultipleMember2023-01-012023-09-3000013260032022-12-310001326003Debt Investments | Software | Bonterra LLC (fka CyberGrants Holdings, LLC) | First Lien Amendment 4 Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 8.00% PIK | Total Coupon 13.39% | Maturity 9/8/20272023-09-300001326003us-gaap:OtherDebtSecuritiesMember2022-09-300001326003Debt Investments | Health Care Providers & Services | PHC Buyer, LLC (Patriot Home Care) | First Lien Delayed Draw Term Loan | SOFR (Q) | Floor rate 0.75% | Spread 6.00% | Total Coupon 11.50% | Maturity 5/4/20282023-09-300001326003bkcc:BlackrockTcpCapitalCorpMembersrt:ScenarioForecastMember2024-08-312024-08-310001326003Debt Investments | Construction & Engineering | Vortex Companies, LLC | First Lien Term Loan | Monthly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.32% | Maturity 9/4/20292023-09-300001326003Debt Investments | Internet Software & Services2023-09-300001326003Debt Investments | Construction & Engineering | Homerenew Buyer, Inc. (Project Dream) | First Lien Revolver | Quarterly SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 12.00% | Maturity 11/23/20272023-09-300001326003Equity Securities | Diversified Financial Services | Worldremit Group Limited (United Kingdom) | Warrants to Purchase Series E Stock | Expiration 8/27/20312022-12-310001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class B Preferred Stock2023-01-012023-09-300001326003Debt Investments | Insurance | IT Parent, LLC (Insurance Technologies) | First Lien Term Loan | SOFR(M) | Floor rate 1.00% | Spread 6.25% | Total Coupon 11.67% | Maturity 10/1/20262023-09-300001326003Debt Investments | Life Sciences Tools & Services | Alcami Corporation | First Lien Delayed Draw Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.42% | Maturity 12/21/20282022-12-310001326003Equity Securities | Household Durables Stitch Holdings, L.P. | Limited Partnership/Limited Liability Company Interests2023-09-300001326003Debt Investments | Software | Elastic Path Software Inc. (Canada) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.50% | Total Coupon 11.33% | Maturity 1/6/20262022-12-310001326003bkcc:HotelsRestaurantsAndLeisureMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:IndustryConcentrationRiskMemberbkcc:InternetSoftwareAndServicesMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMemberbkcc:FixedInterestRateMember2022-12-310001326003Debt Investments | Software | GTY Technology Holdings Inc. | First Lien Revolver | Quarterly SOFR | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.68% | Maturity 7/9/20292023-09-300001326003Debt Investments | Health Care Technology | ESO Solutions, Inc. | First Lien Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 7.00% | Total Coupon 11.59% | Maturity 5/3/20272022-12-3100013260032021-10-012021-12-3100013260032023-01-012023-03-310001326003bkcc:MeasurementInputImpliedVolatilityMember2023-01-012023-09-300001326003srt:MaximumMemberbkcc:SeniorSecuredRevolvingCreditFacility1Member2023-09-062023-09-060001326003us-gaap:GeographicConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Hotels, Restaurants & Leisure | OCM Luxembourg Baccarat Bidco S.A.R.L. (Interblock) (Slovenia) | First Lien Term Loan | SOFR(Q) | Floor rate 0.75% | Spread 6.25% | Total Coupon 10.68% | Maturity 6/3/20272022-12-310001326003Debt Investments | Insurance | Peter C. Foy & Associates Insurance Services, LLC (PCF Insurance) | First Lien Delayed Draw Term Loan | SOFR(S) | Floor rate 0.75% | Spread 6.00% | Total Coupon 11.11% | Maturity 11/1/20282022-12-310001326003Debt Investments | Construction & Engineering | Homerenew Buyer, Inc. (Project Dream) | First Lien Delayed Draw Term Loan | Semiannually SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.36% | Maturity 11/23/20272022-12-310001326003Debt Investments | Technology Hardware, Storage & Peripherals | SumUp Holdings Luxembourg S.A.R.L. (United Kingdom) | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.68% | Maturity 2/17/20262022-12-310001326003us-gaap:FairValueInputsLevel3Member2023-09-300001326003Debt Investments | Software | Superman Holdings, LLC (Foundation Software) | First Lien Revolver | LIBOR(Q) | Floor Rate 1.00% | Spread 6.13% | Total Coupon 10.85% | Maturity 8/31/20262022-12-310001326003Debt Investments | Textiles, Apparel & Luxury Goods | James Perse Enterprises, Inc. | First Lien Revolver | SOFR(S) | Floor Rate 1.00% | Spread 6.25% | Total Coupon 11.38% | Maturity 9/8/20272023-09-300001326003Debt Investments | Media2022-12-310001326003Debt Investments | Textiles, Apparel & Luxury Goods | James Perse Enterprises, Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 6.25% | Total Coupon 10.93% | Maturity 9/8/20272022-12-310001326003us-gaap:CommonStockMember2023-09-300001326003Investment Worldremit Group Limited (United Kingdom) | Warrants to Purchase Series E Stock | Initial Acquisition Date 8/27/20212022-01-012022-12-310001326003Debt Investments | Internet Software & Services | Gympass US, LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 4.00% cash+ 4.00% PIK | Total Coupon 12.77% | Maturity 7/8/20272022-12-310001326003Equity Securities | Diversified Consumer Services | Razor Group GmbH (Germany) | Warrants to Purchase Series C Shares | Expiration 4/28/20282023-09-300001326003Debt Investments | Building Products | Porcelain Acquisition Corporation (Paramount) | First Lien Term Loan | Quarterly LIBOR | Floor Rate 1.00% | Spread 5.75% | Total Coupon 10.48% | Maturity 4/30/20272022-12-310001326003Debt Investments | Media | Streamland Media Midco LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 11.11% | Maturity 8/31/20232022-12-310001326003Debt Investments | Health Care Technology | Appriss Health, LLC (PatientPing) | First Lien Revolver | LIBOR(M) | Floor rate 1.00% | Spread 7.25% | Total Coupon 11.54% | Maturity 5/6/20272022-12-310001326003Debt Investments | Trading Companies & Distributors | Blackbird Purchaser, Inc. (Ohio Transmission Corp.) | Second Lien Delayed Draw Term Loan | LIBOR(M) | Floor Rate 0.75% | Spread 7.50% | Total Coupon 11.88% | Maturity 4/8/20272022-12-310001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Common Stock2023-01-012023-09-300001326003Debt Investments | Trading Companies & Distributors2022-12-310001326003Debt Investments | Construction & Engineering | Sunland Asphalt & Construction, LLC | First Lien Delayed Draw Term Loan | Semiannually LIBOR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.15% | Maturity 1/13/20262022-12-310001326003Debt Investments | Metals & Mining | Kemmerer Operations, LLC (WMLP) | First Lien Term Loan | Fixed | Floor Rate 0.00% | Spread 15.00% PIK | Total Coupon 15.00 % | Maturity 6/21/20232022-12-310001326003Debt Investments | Software | Zendesk, Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 6.50% | Total Coupon 11.90% | Maturity 11/22/20282023-09-300001326003us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2022-12-310001326003bkcc:InvestmentAdvisorExpensesMember2022-01-012022-09-300001326003us-gaap:RetainedEarningsMember2023-09-300001326003bkcc:BlackrockCapitalInvestmentCorporationMember2023-09-060001326003Debt Securities2023-09-300001326003Debt Investments | Commercial Services & Supplies | Kellermeyer Bergensons Services, LLC | First Lien Delayed Draw Term Loan B | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.52% | Maturity 11/7/20262023-09-300001326003Equity Securities | Trading Companies & Distributors | Blackbird Holdco, Inc. (Ohio Transmission Corp.) | Preferred Stock | Total Coupon 12.50% PIK2023-09-300001326003Debt Investments | Textiles, Apparel & Luxury Goods2022-12-310001326003Investment Razor Group GmbH (Germany) | Warrants to Purchase Preferred Series A1 Shares | Initial Acquisition Date 4/28/20212022-01-012022-12-310001326003us-gaap:TreasuryStockCommonMember2023-04-012023-06-300001326003us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-310001326003Debt Investments | Software | Bonterra LLC (fka CyberGrants Holdings, LLC) | First Lien Revolver | LIBOR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.98% | Maturity 9/8/20272022-12-310001326003us-gaap:FairValueInputsLevel2Memberbkcc:BankDebtMember2022-12-310001326003Equity Securities | Internet Software & Services | SuCo Investors, LP (Suited Connector) | Warrants to Purchase Class A Units | Expiration 3/6/20332023-09-3000013260032021-12-310001326003Debt Investments | IT Services | Idera, Inc. | Second Lien Term Loan | LIBOR(Q) | Floor Rate 0.75% | Spread 6.75% | Total Coupon 10.50% | Maturity 2/4/20292022-12-310001326003bkcc:ConstructionAndEngineeringMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Preferred Stock2022-12-310001326003us-gaap:FairValueInputsLevel2Member2023-01-012023-09-300001326003bkcc:SeniorSecuredLoansMembersrt:MaximumMemberus-gaap:BaseRateMember2022-12-310001326003Debt Investments | Internet Software & Services | Magenta Buyer, LLC (McAfee) | First Lien Incremental Term Loan | Fixed | Spread 12.00% | Total Coupon 12.00% | Maturity 7/27/20282023-09-300001326003us-gaap:GeographicConcentrationRiskMembercountry:AUbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Insurance | AmeriLife Holdings, LLC | First Lien Revolver | SOFR(S) | Floor rate 0.75% | Spread 5.75% | Total Coupon 10.99% | Maturity 8/31/20282023-09-300001326003us-gaap:IncomeApproachValuationTechniqueMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003Debt Investments | Insurance | Integrity Marketing Acquisition, LLC | First Lien Incremental Revolver | SOFR(M) | Floor rate 0.75% | Spread 6.50% | Total Coupon 10.82% | Maturity 8/27/20252022-12-310001326003Equity Securities | Diversified Consumer Services2023-09-300001326003us-gaap:EquitySecuritiesMember2023-01-012023-09-300001326003bkcc:DiversifiedFinancialServicesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Software | Kaseya Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 5.75% | Total Coupon 10.33% | Maturity 6/25/20292022-12-310001326003Debt Investments | Paper & Forest Products | Alpine Acquisition Corp II (48Forty) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 5.50% | Total Coupon 9.76 % | Maturity 11/30/20262022-12-310001326003Equity Securities2023-09-300001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMember2023-01-012023-09-300001326003Investment | PerchHQ LLC, | Warrants to Purchase Common Stock | Initial Acquisition Date 9/30/20222023-01-012023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class A Preferred Stock2022-12-310001326003Interest Rate Swap | Company Receives Fixed 2.633% | Company Pays Floating 1 Day SOFR | Counterparty CME | Maturity Date 6/9/2025 | Payment Frequency Annual2022-12-310001326003us-gaap:TreasuryStockCommonMember2022-09-300001326003Equity Securities | Diversified Financial Services | Gordon Brothers Finance Company | Common Stock2023-09-300001326003Equity Securities | Diversified Consumer Services | PerchHQ LLC | Warrants to Purchase Common Stock | Expiration 10/15/20272022-12-310001326003us-gaap:FairValueInputsLevel2Memberbkcc:BankDebtMember2023-09-300001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Common Stock2021-12-310001326003bkcc:AugustTwoTwoThousandTwentyTwoMember2022-07-012022-09-300001326003Debt Investments | Software | Oversight Systems, Inc. | First Lien Term Loan | LIBOR(M) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.38% | Maturity 9/24/20262022-12-310001326003Debt Investments | Software | SEP Eiger BidCo Ltd. (Beqom) (Switzerland) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 3.00% Cash + 3.50% PIK | Total Coupon 10.71% | Maturity 5/9/20282022-12-310001326003Debt Investments | Paper & Forest Products | Alpine Acquisition Corp II (48Forty) | First Lien Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 5.50% | Total Coupon 9.76 % | Maturity 11/30/20262022-12-310001326003bkcc:MeasurementInputBookValueMultiplesMember2023-01-012023-09-300001326003bkcc:ControlledInvestmentMember2023-01-012023-09-300001326003Debt Investments | Capital Markets | Pico Quantitative Trading, LLC | First Lien Incremental Term Loan | Quarterly SOFR | Floor Rate 1.5% | Spread 7.25% | Total Coupon 11.61% | Maturity 2/7/20252022-12-310001326003Debt Investments | Hotels, Restaurants & Leisure | Showtime Acquisition, L.L.C. (World Choice) | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 7.50% | Total Coupon 12.97% | Maturity 8/7/20282023-09-300001326003bkcc:ContainersAndPackagingMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:NonControlledAffiliatedInvestmentsMember2023-09-300001326003us-gaap:CommonStockMember2022-03-310001326003bkcc:MediaMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Health Care Technology | Appriss Health, LLC (PatientPing) | First Lien Term Loan | LIBOR(M) | Floor rate 1.00% | Spread 7.25% | Total Coupon 11.54% | Maturity 5/6/20272022-12-310001326003us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003Equity Securities | Oil, Gas & Consumable Fuels | Trailblazer Energy Resources, LLC (fka ETX Energy, LLC) | Limited Partnership/Limited Liability Company Interests2023-09-300001326003bkcc:DistributorsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Consumer Finance | Freedom Financial Network Funding, LLC | First Lien Delayed Draw Term Loan | Semiannually SOFR | Floor Rate 1.00% | Spread 9.00% | Total Coupon 13.95% | Maturity 9/21/20272022-12-310001326003bkcc:BlackrockTcpCapitalCorpMemberbkcc:AssetsUpToTwoHundredPercentageOfNetValueAssetMember2023-09-062023-09-060001326003us-gaap:OverAllotmentOptionMemberbkcc:FivePointZeroZeroPercentConvertibleNotesDueTwoThousandTwentyTwoMember2017-06-130001326003bkcc:NonControlledAffiliatedInvestmentsMember2023-01-012023-09-300001326003Debt Investments | Commercial Services & Supplies | Kellermeyer Bergensons Services, LLC | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.52% | Maturity 11/7/20262023-09-300001326003Debt Investments | Diversified Consumer Services | SellerX Germany GmbH (Germany) | First Lien Term Loan Tranche A2 | Quarterly SOFR | Spread 4.50% Cash and 4.50% PIK | Total Coupon 14.39% | Maturity 5/23/20262023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:ITServicesMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Interest Rate Swap | Company Receives Fixed 2.633% | Company Pays Floating 1 Day SOFR | Counterparty CME | Maturity Date 6/9/2025 | Payment Frequency Annual2022-01-012022-12-310001326003srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:TreasuryStockCommonMember2022-01-012022-03-3100013260032023-03-310001326003Debt Investments | Software | AlphaSense, Inc | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.44% | Maturity 3/11/20272022-12-310001326003us-gaap:CommonStockMember2022-01-012022-03-310001326003Debt Investments | Internet Software & Services | Pluralsight, Inc. | First Lien Term Loan | LIBOR(Q) | Floor Rate 1.00% | Spread 8.00% | Total Coupon 11.83% | Maturity 4/6/20272022-12-310001326003us-gaap:OtherDebtSecuritiesMember2021-12-310001326003bkcc:IndustryConcentrationRiskMemberbkcc:HealthCareEquipmentAndSuppliesMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003srt:MaximumMemberbkcc:SeniorSecuredRevolvingCreditFacility1Member2023-09-060001326003Debt Investments | Internet Software & Services | Pluralsight, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 8.00% | Total Coupon 13.45% | Maturity 4/6/20272023-09-300001326003us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003us-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputEBITDAOrRevenueMultiplesMember2022-12-310001326003bkcc:ControlledInvestmentMember2022-12-310001326003bkcc:BankDebtMember2023-07-012023-09-300001326003Equity Securities | Diversified Financial Services | Worldremit Group Limited (United Kingdom) | Warrants to Purchase Series D Stock | Expiration 2/11/20312023-09-300001326003Debt Investments | Health Care Technology | CareATC, Inc. | First Lien Revolver | SOFR(Q) | Floor rate 1.00% | Spread 7.25% | Total Coupon 13.26% | Maturity 3/14/20242023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:InternetSoftwareAndServicesMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Media2023-09-300001326003Debt Investments | Internet Software & Services | Bynder Bidco, Inc. (Netherlands) | First Lien Term Loan A | SOFR(Q) | Floor Rate 1.00% | Spread 7.25% | Total Coupon 12.60% | Maturity 1/26/20292023-09-300001326003Debt Investments | Commercial Services & Supplies | Thermostat Purchaser III, Inc. (Reedy Industries) | Second Lien Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 7.25% | Total Coupon 12.82% | Maturity 8/31/20292023-09-300001326003Debt Investments | Pharmaceuticals | Nephron Pharmaceuticals Corp. et al | First Lien Term Loan | SOFR(Q) | Floor Rate 1.50% | Spread 9.00% | Total Coupon 14.57% | Maturity 9/11/20262023-09-300001326003Debt Investments | Software | Zilliant Incorporated | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 2.00% Cash + 4.50% PIK | Total Coupon 11.92% | Maturity 12/21/20272023-09-300001326003Debt Investments | Media | NEP Group, Inc. et al | Second Lien Term Loan | SOFR(M) | Spread 7.00% | Total Coupon 12.43% | Maturity 10/19/20262023-09-300001326003bkcc:SeniorSecuredLoanFirstLienMember2023-09-300001326003Equity Securities | Diversified Consumer Services | Elevate Brands Holdco | Warrants to Purchase Elevate Common Shares | Expiration 7/25/20302023-09-300001326003Debt Investments | Professional Services | JobandTalent USA, Inc. (United Kingdom) | First Lien Delayed Draw Term Loan (3.0% Exit Fee) | SOFR | Floor Rate 1.00% | Spread 8.75 % | Total Coupon 13.19% | Maturity 2/17/20252022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacilityMember2022-12-310001326003us-gaap:GeographicConcentrationRiskMembercountry:GBbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Insurance | Peter C. Foy & Associates Insurance Services, LLC (PCF Insurance) | First Lien Delayed Draw Term Loan | SOFR(M) | Floor rate 0.75% | Spread 6.00% | Total Coupon 11.43% | Maturity 11/1/20282023-09-300001326003us-gaap:RetainedEarningsMember2022-03-310001326003us-gaap:CommonStockMember2022-07-012022-09-300001326003Debt Investments | Professional Services | ICIMS, Inc. | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 3.38% Cash + 3.88% PIK | Total Coupon 12.63% | Maturity 8/18/20282023-09-300001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Unsecured Debt2021-12-310001326003us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputEBITDAOrRevenueMultiplesMember2022-12-310001326003srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2021-12-310001326003Debt Investments | Diversified Financial Services | 2-10 Holdco, Inc. | First Lien Revolver | SOFR (M) | Floor Rate 0.75% | Spread 6.00% | Total Coupon 10.42% | Maturity 3/26/20262022-12-310001326003Debt Investments | Diversified Financial Services | Accordion Partners LLC | First Lien Delayed Draw Term Loan A | Quarterly SOFR | Floor Rate 0.75% | Spread 6.50% | Total Coupon 11.08% | Maturity 8/29/20292022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacilityMembersrt:MinimumMemberbkcc:LiborMember2022-12-310001326003Debt Investments | Construction & Engineering | Homerenew Buyer, Inc. (Project Dream) | First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 12.02% | Maturity 11/23/20272023-09-300001326003us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003bkcc:DiversifiedConsumerServicesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Investment | Stitch Holdings, L.P. | Limited Partnership Interests | Initial Acquisition Date 7/30/20212023-01-012023-09-300001326003Debt Investments | Internet Software & Services | Oranje Holdco, Inc. (KnowBe4) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.75% | Total Coupon 13.12% | Maturity 2/1/20292023-09-300001326003Equity Securities | Media | MBS Parent, LLC | Limited Partnership/Limited Liability Company Interests2022-12-310001326003us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel1Member2023-09-300001326003Equity Securities | Chemicals | AGY Equity, LLC | Class C Common Stock2023-09-300001326003Debt Investments | Diversified Financial Services | Callodine Commercial Finance, LLC | Subordinated Debt | SOFR(M) | Floor Rate 0.25% | Spread 8.50% | Total Coupon 14.06% | Maturity 10/8/20272023-09-300001326003Debt Investments | IT Services2022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacility1Member2023-01-012023-06-300001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-01-012022-12-310001326003bkcc:MetalsAndMiningMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:BlackrockCapitalInvestmentCorporationMember2023-01-012023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:RoadAndRailMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Internet Software & Services | Gympass US, LLC | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 4.00% cash+ 4.00% PIK | Total Coupon 13.45% | Maturity 7/8/20272023-09-300001326003Debt Investments | Internet Software & Services | Magenta Buyer, LLC (McAfee) | First Lien Incremental Term Loan | Fixed | Spread 12.00% | Total Coupon 12.00% | Maturity 7/27/20282022-12-310001326003Interest Rate Swap | Company Receives Fixed 2.633% | Company Pays Floating 1 Day SOFR | Counterparty CME | Maturity Date 6/9/2025 | Payment Frequency Annual2023-01-012023-09-300001326003us-gaap:TreasuryStockCommonMember2022-07-012022-09-300001326003Debt Investments | Health Care Technology | Sandata Technologies, LLC | First Lien Term Loan | LIBOR(Q) | Spread 6.00% | Total Coupon 10.29% | Maturity 7/23/20242022-12-310001326003us-gaap:EquitySecuritiesMember2022-04-012022-06-300001326003bkcc:BlackrockTcpCapitalCorpMemberbkcc:AssetsExceedingTwoHundredPercentageOfNetValueAssetMember2023-09-062023-09-060001326003srt:MaximumMemberbkcc:SeniorSecuredLoansMemberus-gaap:BaseRateMember2023-09-300001326003Debt Investments | Internet Software & Services | Bynder Bidco B.V. (Netherlands) | First Lien Revolver A | SOFR(Q| Floor Rate 1.00% | Spread 7.25% | Total Coupon 12.60% | Maturity 1/26/20292023-09-300001326003Debt Investments | Containers & Packaging | PVHC Holding Corp | First Lien Term Loan | Quarterly SOFR | Floor Rate 2.50% | Spread 5.50% Cash + .75% PIK | Total Coupon 11.79% | Maturity 2/17/20272023-09-300001326003Non-Controlled Affiliate Security2023-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacilityMembersrt:MinimumMember2022-12-310001326003Debt Investments | Paper & Forest Products2022-12-310001326003bkcc:FivePointZeroZeroPercentConvertibleNotesDueTwoThousandTwentyTwoMemberus-gaap:IPOMember2017-06-130001326003Debt Investments | Internet Software & Services | Persado, Inc. | First Lien Term Loan (6.575% Exit Fee) | SOFR(M) | Floor Rate 1.80% | Spread 7.00% | Total Coupon 11.12% | Maturity 6/10/20272022-12-3100013260032022-01-012022-09-300001326003us-gaap:FairValueInputsLevel2Memberus-gaap:EquitySecuritiesMember2022-12-310001326003Equity Securities | Diversified Consumer Services2022-12-310001326003Equity Securities | Capital Markets | Pico Quantitative Trading Holdings, LLC | Warrants to Purchase Membership Units | Expiration 2/7/20302023-09-300001326003bkcc:ValuationDesigneeMember2023-09-300001326003Debt Investments | Diversified Consumer Services2023-09-3000013260032021-03-310001326003bkcc:BlackrockCapitalInvestmentCorporationMember2023-07-012023-09-300001326003us-gaap:FairValueInputsLevel1Memberus-gaap:OtherDebtSecuritiesMember2022-12-310001326003Debt Investments | Software | Superman Holdings, LLC (Foundation Software) | First Lien Term Loan | LIBOR(Q) | Floor Rate 1.00% | Spread 6.13% | Total Coupon 10.85% | Maturity 8/31/20272022-12-310001326003us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2023-01-012023-09-300001326003Debt Investments | Health Care Providers & Services | Opco Borrower, LLC (Giving Home Health Care) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.99% | Maturity 8/19/20272023-09-300001326003Debt Investments | Hotels, Restaurants & Leisure2022-12-310001326003us-gaap:SubordinatedDebtMember2022-12-310001326003Debt Investments | Automobiles2023-09-300001326003Debt Investments | Internet Software & Services | Quartz Holding Company (Quick Base) | Second Lien Term Loan | LIBOR(M) | Floor | Spread 8.00% | Total Coupon 12.38% | Maturity 4/2/20272022-12-310001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Common Stock2022-12-310001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-300001326003Debt Investments | Software | Grey Orange Incorporated | First Lien Delayed Draw Term Loan (3.75% Exit Fee) | Quarterly SOFR | Floor Rate 1.00% | Spread 7.25% | Total Coupon 12.79% | Maturity 5/6/20262023-09-300001326003Debt Investments | Software | SEP Raptor Acquisition, Inc. (Loopio) (Canada)| First Lien Revolver| Quarterly SOFR | Floor Rate 1.00% | Spread 7.00%| Total Coupon 12.52%| Maturity 3/31/20272023-09-300001326003Cash and Cash Equivalents2023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:ElectricalEquipmentMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:NonControlledNonAffiliatedInvestmentsMember2022-12-310001326003us-gaap:RetainedEarningsMember2022-09-300001326003Debt Investments | Internet Software & Services | Suited Connector, LLC | First Lien Revolver | LIBOR(S) | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.98% | Maturity 12/1/20272022-12-310001326003Debt Investments | Software | Kaseya Inc. | First Lien Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 3.75% Cash + 2.50% PIK | Total Coupon 11.62% | Maturity 6/25/20292023-09-300001326003us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Preferred Stock2021-12-310001326003Debt Investments | Internet Software & Services | Spartan Bidco Pty Ltd (StarRez) (Australia) | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 0.75% cash + 6.50% PIK | Total Coupon 11.46% | Maturity 1/24/20282022-12-310001326003Debt Investments | Health Care Providers & Services2023-09-300001326003us-gaap:AdditionalPaidInCapitalMember2023-09-300001326003us-gaap:IncomeApproachValuationTechniqueMemberus-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003Debt Investments | Health Care Providers & Services | Opco Borrower, LLC (Giving Home Health Care) | First Lien Revolver | SOFR(M) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 10.87% | Maturity 8/19/20272022-12-310001326003Debt Investments | Internet Software & Services | CommerceHub, Inc. | First Lien Term Loan | Quarterly LIBOR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.41% | Maturity 11/7/20262022-12-310001326003Debt Investments | Diversified Financial Services | 2-10 Holdco, Inc. | First Lien Term Loan | SOFR(M) | Floor Rate 0.75% | Spread 6.00% | Total Coupon 11.42% | Maturity 3/26/20262023-09-300001326003Debt Investments | Health Care Providers & Services | PHC Buyer, LLC (Patriot Home Care) | First Lien Delayed Draw Term Loan | SOFR(S) | Floor rate 0.75% | Spread 6.00% | Total Coupon 10.70% | Maturity 5/4/20282022-12-310001326003Debt Investments | IT Services | Avalara, Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 7.25% | Total Coupon 11.83% | Maturity 10/19/20282022-12-310001326003us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003Debt Investments | Diversified Financial Services | Accordion Partners LLC | First Lien Delayed Draw Term Loan B | SOFR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.62% | Maturity 8/29/20292023-09-300001326003bkcc:ProfessionalServicesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Diversified Financial Services2023-09-300001326003Non-Controlled Affiliate Security2022-12-310001326003Debt Investments | Software | Tessian Inc. (United Kingdom) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 8.00% | Total Coupon 13.58% | Maturity 3/15/20282023-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacility1Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-04-262023-04-260001326003Debt Investments | Software | Bonterra LLC (fka CyberGrants Holdings, LLC) | First Lien Term Loan | LIBOR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.98% | Maturity 9/8/20272022-12-310001326003bkcc:IndustryConcentrationRiskMemberbkcc:HealthCareTechnologyMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003us-gaap:AdditionalPaidInCapitalMember2022-07-012022-09-300001326003us-gaap:EquitySecuritiesMember2022-01-012022-09-300001326003Debt Investments | Professional Services | RigUp, Inc. | First Lien Delayed Draw Term Loan (4.0% Exit Fee) | LIBOR(M) | Floor Rate 1.50% | Spread 7.00% | Total Coupon 11.81% | Maturity 3/1/20242022-12-310001326003Debt Investments | Internet Software & Services2022-12-310001326003Debt Investments | Internet Software & Services | Suited Connector, LLC | First Lien Term Loan | LIBOR(S) | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.92% | Maturity 12/1/20272022-12-310001326003bkcc:ContainersAndPackagingMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Controlled Affiliate Security2021-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacility1Member2023-01-012023-09-300001326003Debt Investments | Health Care Providers & Services | Team Services Group, LLC | Second Lien Term Loan | LIBOR(S) | Floor rate 1.00% | Spread 9.00% | Total Coupon 13.93% | Maturity 11/13/20282022-12-310001326003bkcc:FivePointZeroZeroPercentConvertibleNotesDueTwoThousandTwentyTwoMember2017-06-132017-06-130001326003Debt Investments | Health Care Providers & Services | PHC Buyer, LLC (Patriot Home Care) | First Lien Term Loan | SOFR(Q) | Floor rate 0.75% | Spread 6.00% | Total Coupon 11.50% | Maturity 5/4/20282023-09-300001326003srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:TreasuryStockCommonMember2021-12-310001326003Debt Investments | Software | Oversight Systems, Inc. | First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 7.75% | Total Coupon 13.22% | Maturity 9/24/20262023-09-300001326003us-gaap:MeasurementInputRevenueMultipleMemberbkcc:BankDebtMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003bkcc:BlackrockCapitalInvestmentCorporationMember2023-09-300001326003Debt Investments | Health Care Technology | Sandata Technologies, LLC | First Lien Revolver | SOFR(Q) | Spread 6.00% |Total Coupon 11.53% | Maturity 7/23/20242023-09-300001326003Debt Investments | Leisure Products | Peloton Interactive, Inc. | First Lien Term Loan | SOFR(S) | Floor Rate 0.50% | Spread 7.00% | Total Coupon 12.26% | Maturity 5/25/20272023-09-300001326003us-gaap:CommonStockMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2022-01-012022-03-310001326003Debt Investments | Life Sciences Tools & Services | Alcami Corporation | First Lien Revolver | SOFR(M) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.42% | Maturity 12/21/20282022-12-310001326003Debt Investments | Health Care Providers & Services2022-12-310001326003Non Controlled Affiliated Investments2022-12-310001326003Debt Investments | Wireless Telecommunication Services | OpenMarket, Inc. (Infobip) (United Kingdom) | First Lien Term Loan | LIBOR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.98% | Maturity 9/17/20262022-12-310001326003us-gaap:GeographicConcentrationRiskMembercountry:DEbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003us-gaap:IncomeApproachValuationTechniqueMembersrt:MaximumMemberbkcc:BankDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003Debt Investments | Professional Services| DTI Holdco, Inc. (Epiq Systems, Inc.) | Second Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 7.75% | Total Coupon 13.12% | Maturity 04/26/20302023-09-300001326003us-gaap:FairValueInputsLevel1Memberbkcc:BankDebtMember2023-09-300001326003bkcc:ConstructionAndEngineeringMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class B Preferred Stock2021-12-310001326003us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-300001326003Debt Investments | Internet Software & Services | Sailpoint Technologies Holdings, Inc. | First Lien Term Loan | SOFR(M) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.58% | Maturity 8/16/20292023-09-300001326003us-gaap:MeasurementInputEbitdaMultipleMemberbkcc:BankDebtMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003Debt Investments | Media | NEP II, Inc. | Second Lien Term Loan | LIBOR(M) | Spread 7.00% | Total Coupon 11.38% | Maturity 10/19/20262022-12-310001326003Debt Investments | Software | Elastic Path Software Inc. (Canada) | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 7.50% | Total Coupon 13.03%| Maturity 1/6/20262023-09-300001326003Debt Investments | Distributors Colony Display LLC | First Lien Term Loan | Semiannaually SOFR | Floor Rate 1.00% | Spread 9.50% | Total Coupon 13.91% | Maturity 6/30/20262022-12-310001326003Debt Investments | Machinery2022-12-310001326003Debt Investments | Internet & Catalog Retail | Syndigo, LLC | Second Lien Term Loan | LIBOR(S) | Floor Rate 0.75% | Spread 8.00% | Total Coupon 13.21% | Maturity 12/14/20282022-12-3100013260032021-06-300001326003Debt Investments | Software | Aerospike, Inc.| First Lien Delayed Draw Term Loan (0.50% Exit Fee) | Monthly SOFR | Floor Rate 1.00% | Spread 7.50% | Total Coupon 12.94% | Maturity 12/29/20252023-09-300001326003us-gaap:EquitySecuritiesMember2023-09-300001326003Debt Investments | Containers & Packaging | BW Holding, Inc. (Brook & Whittle) | Second Lien Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 7.50% | Total Coupon 12.05% | Maturity 12/14/20292022-12-310001326003bkcc:LifeSciencesToolsAndServicesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Textiles, Apparel & Luxury Goods | James Perse Enterprises, Inc. | First Lien Term Loan | SOFR(S) | Floor Rate 1.00% | Spread 6.25% | Total Coupon 11.38% | Maturity 9/8/20272023-09-300001326003Equity Securities | Capital Markets | Marsico Holdings, LLC | Limited Partnership/Limited Liability Company Interests2023-09-300001326003us-gaap:MeasurementInputRevenueMultipleMemberbkcc:MarketComparableCompaniesMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003bkcc:IndustryConcentrationRiskMemberbkcc:WirelessTelecommunicationServicesMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Diversified Financial Services | GC Champion Acquisition LLC (Numerix) | First Lien Delayed Draw Term Loan | SOFR(S) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 11.28% | Maturity 8/21/20282023-09-300001326003Equity Securities | Diversified Consumer Services | PerchHQ LLC | Warrants to Purchase Common Stock | Expiration 10/15/20272023-09-300001326003Equity Securities | Diversified Financial Services | Worldremit Group Limited (United Kingdom) | Warrants to Purchase Series E Stock | Expiration 8/27/20312023-09-300001326003Debt Investments | Internet & Catalog Retail | CommerceHub, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.77% | Maturity 12/29/20272023-09-300001326003Equity Securities | Oil, Gas & Consumable Fuels2022-12-310001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberbkcc:TrancheTwoMember2022-06-090001326003us-gaap:GeographicConcentrationRiskMembercountry:USbkcc:InvestmentsAtFairValueMember2023-01-012023-09-3000013260032023-06-300001326003Equity Securities | Capital Markets | Pico Quantitative Trading Holdings, LLC | Warrants to Purchase Membership Units | Expiration 2/7/2030 2022-12-310001326003us-gaap:AdditionalPaidInCapitalMember2022-12-310001326003bkcc:BankDebtMember2022-07-012022-09-300001326003Debt Investments | Software2022-12-310001326003Debt Investments | Software | Kong Inc. | First Lien Term Loan | Monthly SOFR | Floor Rate 1.00% | Spread 5.50% Cash + 3.25% PIK | Total Coupon 14.19% | Maturity 11/1/20272023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:PharmaceuticalsMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Diversified Financial Services | Accordion Partners LLC | First Lien Delayed Draw Term Loan B | Quarterly SOFR | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.83% | Maturity 8/29/20292022-12-310001326003Equity Securities | Chemicals | AGY Equity, LLC | Class C Common Stock2022-12-310001326003Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Senior Secured Loan, First Lien2022-01-012022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacilityMemberbkcc:LiborMember2022-01-012022-12-310001326003us-gaap:AdditionalPaidInCapitalMember2021-12-310001326003Debt Investments | IT Services | Avalara, Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 7.25% | Total Coupon 12.64% | Maturity 10/19/20282023-09-300001326003Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Senior Secured Loan, First Lien2022-12-310001326003Debt Investments2023-09-300001326003Debt Investments | Internet Software & Services | Suited Connector, LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.00% cash + 2.00% PIK | Total Coupon 13.31% | Maturity 12/1/20272023-09-300001326003Debt Investments | Diversified Consumer Services | Thras.io, LLC) | First Lien Term Loan | Quarterly SOFR | Spread 7.00% | Total Coupon 12.65% | Maturity 12/18/20262023-09-300001326003us-gaap:OtherDebtSecuritiesMember2022-07-012022-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:SoftwareMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:CommercialServicesAndSuppliesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003us-gaap:InterestRateSwapMember2023-01-012023-09-300001326003Investment Razor Group GmbH (Germany) | Warrants to Purchase Series C Shares | Initial Acquisition Date 12/23/20222022-01-012022-12-310001326003Debt Investments | Diversified Financial Services | Accordion Partners LLC | First Lien Delayed Draw Term Loan A | SOFR (Q)| Floor Rate 0.75% | Spread 6.50% | Total Coupon 11.89% | Maturity 8/29/20292023-09-300001326003Debt Investments | Software | SEP Eiger BidCo Ltd. (Beqom) (Switzerland)| First Lien Term Loan| Quarterly SOFR | Floor Rate 1.00% | Spread 3.00% Cash + 3.50% PIK | Total Coupon 11.87% | Maturity 5/9/20282023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class C Common Stock2022-01-012022-12-310001326003bkcc:UnsecuredConvertibleSeniorNotesDue2022Member2023-01-012023-06-300001326003Debt Investments | Construction & Engineering | CSG Buyer, Inc. (Core States) | First Lien Revolver | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.65% | Maturity 3/31/20282023-09-300001326003srt:MinimumMemberbkcc:SeniorSecuredRevolvingCreditFacility1Member2023-09-060001326003us-gaap:RetainedEarningsMember2022-07-012022-09-300001326003Debt Investments | Health Care Technology | Gainwell Acquisition Corp. | Second Lien Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 8.00% | Total Coupon 13.37% | Maturity 10/2/20282023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:TradingCompaniesAndDistributorsMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Software | GTY Technology Holdings Inc. | First Lien Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 2.58% Cash + 4.30% PIK | Total Coupon 12.27% | Maturity 7/9/20292023-09-3000013260032021-04-012021-06-300001326003Equity Securities | Oil, Gas & Consumable Fuels | Trailblazer Energy Resources, LLC (fka ETX Energy, LLC) | Limited Partnership/Limited Liability Company Interests2022-12-310001326003Debt Investments | Professional Services | GI Consilio Parent, LLC | Second Lien Term Loan | SOFR(M) | Floor Rate 0.50% | Spread 7.50% | Total Coupon 12.93% | Maturity 5/14/20292023-09-300001326003Debt Investments | Software | Integrate.com, Inc. (Infinity Data, Inc.) | First Lien Revolver | SOFR(M) | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.28% | Maturity 12/17/20272022-12-310001326003bkcc:BankDebtMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2023-09-300001326003us-gaap:ForeignExchangeForwardMember2023-09-300001326003Debt Investments | Internet Software & Services | Astra Acquisition Corp. (Anthology) | Second Lien Term Loan | LIBOR(M) | Floor Rate 0.75% | Spread 8.88% | Total Coupon 13.26% | Maturity 10/25/20292022-12-310001326003Debt Investments | Professional Services | TLE Holdings, LLC | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 5.50% | Total Coupon 10.92% | Maturity 6/28/20242023-09-300001326003Debt Investments | IT Services |Ensono, Inc | Second Lien Term Loan B | SOFR(M) | Spread 8.00% | Total Coupon 13.43% | Maturity 5/28/20292023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class C Common Stock2023-01-012023-09-300001326003Debt Investments | Textiles, Apparel & Luxury Goods | James Perse Enterprises, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.25% | Total Coupon 10.93% | Maturity 9/8/20272022-12-310001326003bkcc:RealEstateManagementAndDevelopmentMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2022-01-012022-03-310001326003Debt Investments | IT Services | Madison Logic Holdings, Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 12.39% | Maturity 12/30/20272023-09-300001326003us-gaap:AdditionalPaidInCapitalMember2022-03-310001326003Debt Investments | Internet Software & Services | Persado, Inc. | First Lien Term Loan (6.575% Exit Fee) | SOFR(M) | Floor Rate 1.80% | Spread 7.50% | Total Coupon 12.83% | Maturity 6/10/20272023-09-300001326003Debt Investments | Diversified Consumer Services | Fusion Holding Corp. (Finalsite) | First Lien Revolver | Quarterly SOFR | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.64% | Maturity 9/15/20272023-09-300001326003Debt Investments | Semiconductors & Semiconductor Equipment2023-09-300001326003Investment Elevate Brands Holdco Inc. | Warrants to Purchase Preferred Stock | Initial Acquisition Date 3/14/20222022-01-012022-12-310001326003us-gaap:IncomeApproachValuationTechniqueMembersrt:MinimumMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003us-gaap:TreasuryStockCommonMember2023-03-310001326003Debt Investments | Consumer Finance | Freedom Financial Network Funding, LLC | First Lien Term Loan | Semiannually SOFR | Floor Rate 1.00% | Spread 9.00% | Total Coupon 14.54% | Maturity 9/21/20272023-09-300001326003Debt Investments | Media | NEP Group, Inc. et al | First Lien Term Loan | SOFR(M) | Spread 3.25% | Total Coupon 8.68% | Maturity 10/20/20252023-09-300001326003bkcc:ProfessionalServicesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Health Care Providers & Services | Outcomes Group Holdings, Inc. | Second Lien Term Loan | SOFR(Q) | Floor rate 0.50% | Spread 7.50% | Total Coupon 18.02% | Maturity 10/26/20262023-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacility1Membersrt:MinimumMember2023-04-260001326003Non-Controlled Affiliate Security2021-12-310001326003Debt Investments | Health Care Providers & Services | Opco Borrower, LLC (Giving Home Health Care) | First Lien Revolver | (Q)SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.99% | Maturity 8/19/20272023-09-300001326003us-gaap:TreasuryStockCommonMember2022-01-012022-03-310001326003Debt Investments | Real Estate Management & Development | Greystone Affordable Housing Initiatives, LLC | First Lien Delayed Draw Term Loan | SOFR(S) | Floor Rate 1.25% | Spread 6.00% | Total Coupon 11.84% | Maturity 3/2/20262023-09-300001326003Debt Investments | Machinery2023-09-300001326003Debt Investments | Construction & Engineering | Homerenew Buyer, Inc. (Project Dream) | First Lien Term Loan | Semiannually SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.54% | Maturity 11/23/20272022-12-310001326003us-gaap:IncomeApproachValuationTechniqueMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003Debt Investments | Professional Services | VT TopCo, Inc. (Veritext) | Second Lien Term Loan | LIBOR(M) | Floor Rate 0.75% | Spread 6.75% | Total Coupon 11.13% | Maturity 8/4/20262022-12-310001326003us-gaap:GeographicConcentrationRiskMembercountry:CHbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Software | Backoffice Associates Holdings, LLC (Syniti).| First Lien Term Loan| Semiannually SOFR | Floor Rate 1.00% | Spread 7.75%| Total Coupon 12.78% | Maturity 04/30/20262023-09-300001326003Equity Securities | Diversified Consumer Services | Razor Group GmbH (Germany) | Warrants to Purchase Preferred Series A1 Shares | Expiration 4/28/20282022-12-310001326003Debt Investments | Insurance | AmeriLife Holdings, LLC | First Lien Term Loan | SOFR(Q) | Floor rate 0.75% | Spread 5.75% | Total Coupon 9.58% | Maturity 8/31/20292022-12-310001326003bkcc:IndustryConcentrationRiskMemberbkcc:RoadAndRailMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:TechnologyHardwareStorageAndPeripheralsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2022-09-300001326003us-gaap:IncomeApproachValuationTechniqueMembersrt:MaximumMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003Debt Investments | Diversified Financial Services | Callodine Commercial Finance, LLC | First Lien Term Loan | Quarterly LIBOR | Floor Rate 1.00% | Spread 9.00% | Total Coupon 13.73% | Maturity 11/3/20252022-12-310001326003Non-Controlled Affiliate Security2023-01-012023-09-300001326003Restricted Securities2023-09-300001326003us-gaap:FairValueInputsLevel2Memberus-gaap:EquitySecuritiesMember2023-09-300001326003Debt Investments | Internet Software & Services | Suited Connector, LLC | First Lien Delayed Draw Term Loan | LIBOR(S) | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.92% | Maturity 12/1/20272022-12-310001326003Debt Investments | Specialty Retail | Calceus Acquisition, Inc. (Cole Haan) | First Lien Term Loan | SOFR(Q) | Floor Rate 2.00% | Spread 6.75% | Total Coupon 12.14% | Maturity 8/15/20282023-09-300001326003us-gaap:PreferredStockMember2023-09-300001326003Debt Investments | Specialty Retail | Calceus Acquisition, Inc. (Cole Haan) | First Lien Sr Secured Notes | Fixed | Spread 9.75% | Total Coupon 9.75% | Maturity 2/19/20252022-12-310001326003Debt Investments Automobiles2022-12-310001326003us-gaap:TreasuryStockCommonMember2023-07-012023-09-300001326003us-gaap:FairValueInputsLevel1Member2023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:TradingCompaniesAndDistributorsMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:TextilesApparelAndLuxuryGoodsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003us-gaap:IncomeApproachValuationTechniqueMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003bkcc:UnsecuredDebtSecuritiesMember2022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacility1Membersrt:MinimumMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-060001326003Debt Investments | Internet Software & Services | InMoment, Inc. | First Lien Term Loan | SOFR(S) | Floor Rate 0.75% | Spread 5.00% cash+ 2.50% PIK | Total Coupon 11.58% | Maturity 6/8/20282022-12-310001326003Debt Investments | Software | Trintech, Inc. | First Lien Term Revolver | SOFR(M) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.82% | Maturity 7/25/20292023-09-300001326003Debt Investments | Machinery | Sonnys Enterprises, LLC | First Lien Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 12.27% | Maturity 8/5/20272023-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacilityMember2023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class C Common Stock2023-09-300001326003us-gaap:CommonStockMember2023-04-012023-06-300001326003Debt Investments | Software | Zendesk, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 3.50% Cash + 3.50% PIK | Total Coupon 12.15% | Maturity 11/22/20282023-09-300001326003us-gaap:MeasurementInputExpectedTermMember2023-01-012023-09-3000013260032022-10-012022-12-310001326003Debt Investments | Construction & Engineering | CSG Buyer, Inc. (Core States) | First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.84% | Maturity 3/31/20282022-12-310001326003bkcc:LeisureProductsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:TextilesApparelAndLuxuryGoodsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class B Preferred Stock2022-12-3100013260032021-09-300001326003us-gaap:GeographicConcentrationRiskMembercountry:AUbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Consumer Finance | Lucky US BuyerCo LLC (Global Payments) | First Lien Revolver | Monthly SOFR | Floor Rate 1.00% | Spread 7.50% | Total Coupon 12.82% | Maturity 3/30/20292023-09-300001326003Debt Investments | Software | Aras Corporation.| First Lien Revolver| Quarterly SOFR | Floor Rate 1.00% | Spread 6.50%| Total Coupon 12.14% | Maturity 04/13/20272023-09-300001326003Debt Investments | Hotels, Restaurants & Leisure | OCM Luxembourg Baccarat Bidco S.A.R.L. (Interblock) (Slovenia) | First Lien Revolver | SOFR(Q) | Floor rate 0.75% | Spread 6.25% | Total Coupon 10.68% | Maturity 6/3/20272022-12-310001326003Debt Investments | Life Sciences Tools & Services2022-12-310001326003Debt Investments | Health Care Providers & Services | Outcomes Group Holdings, Inc. | Second Lien Term Loan | LIBOR(Q) | Spread 7.50% | Total Coupon 12.23% | Maturity 10/26/20262022-12-310001326003Debt Investments | Software | Zilliant Incorporated | First Lien Delayed Draw Term Loan | LIBOR(M) | Floor Rate 0.75% | Spread 2.00% Cash + 4.50% PIK | Total Coupon 10.85% | Maturity 12/21/20272022-12-310001326003Debt Investments | Health Care Technology | Appriss Health, LLC (PatientPing) | First Lien Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 7.25% | Total Coupon 12.23% | Maturity 5/6/20272023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:PharmaceuticalsMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Diversified Consumer Services | Elevate Brands OpCo LLC | First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 8.50% | Total Coupon 13.23% | Maturity 3/15/20272022-12-310001326003Controlled Affiliated Investments2022-12-310001326003us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003Debt Investments | Insurance | Integrity Marketing Acquisition, LLC | First Lien Incremental Term Loan | SOFR(M) | Floor rate 0.75% | Spread 6.50% | Total Coupon 10.82% | Maturity 8/27/20252022-12-310001326003us-gaap:FairValueInputsLevel2Memberus-gaap:OtherDebtSecuritiesMember2022-12-310001326003Debt Investments | Software | Kong Inc. | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 5.50% Cash + 3.25% PIK | Total Coupon 12.99% | Maturity 11/1/20272022-12-310001326003bkcc:BankDebtMember2023-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacilityMembersrt:MaximumMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-300001326003Debt Investments | Health Care Providers & Services | Team Services Group, LLC | Second Lien Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 9.00% | Total Coupon 14.88% | Maturity 11/13/20282023-09-300001326003srt:MinimumMember2023-09-060001326003us-gaap:IncomeApproachValuationTechniqueMemberbkcc:BankDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003Debt Investments | Construction & Engineering | CSG Buyer, Inc. (Core States) | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.84% | Maturity 3/31/20282022-12-310001326003Debt Investments | Leisure Products | Peloton Interactive, Inc. | First Lien Term Loan | SOFR(S) | Floor Rate 0.50% | Spread 7.00% | Total Coupon 11.76% | Maturity 5/25/20272022-12-310001326003Equity Securities | Software | Grey Orange International Inc. | Warrants to Purchase Common Stock | Expiration 5/6/20322023-09-300001326003Debt Investments | Health Care Technology | Sandata Technologies, LLC | First Lien Delayed Draw Term Loan | SOFR(Q) | Spread 6.00% | Total Coupon 11.55% | Maturity 7/23/20242023-09-300001326003Equity Securities | Capital Markets2023-09-300001326003Non-Controlled Affiliate Security2022-01-012022-12-310001326003Debt Investments | Software | Bluefin Holding, LLC (Allvue) | First Lien Term Loan| Semiannually SOFR | Floor Rate 1.00% | Spread 7.25 | Total Coupon 12.72% | Maturity 9/12/20292023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class A Preferred Stock2022-01-012022-12-310001326003Equity Securities | Media | MBS Parent, LLC | Limited Partnership/Limited Liability Company Interests2023-09-300001326003us-gaap:FairValueInputsLevel3Member2022-12-310001326003Debt Investments | IT Services | Madison Logic Holdings, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 12.39% | Maturity 12/29/20282023-09-300001326003bkcc:SemiconductorsAndSemiconductorEquipmentMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:InternetAndCatalogRetailMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Specialty Retail | Hanna Andersson, LLC | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 6.00% | Total Coupon 12.92% | Maturity 7/2/20262023-09-300001326003Investment Advanced Lighting Technologies, LLC | Senior Secured Notes | Initial Acquisition Date 3/16/20212022-01-012022-12-310001326003Debt Investments | Health Care Technology | Sandata Technologies, LLC | First Lien Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 6.00% |Total Coupon 11.54% | Maturity 7/23/20242023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class C Common Stock2022-12-310001326003Debt Investments | Insurance2023-09-300001326003us-gaap:TreasuryStockCommonMember2022-12-310001326003Debt Investments | Internet Software & Services | Pluralsight, Inc. | First Lien Revolver | LIBOR(M) | Floor Rate 1.00% | Spread 8.00% | Total Coupon 12.36% | Maturity 4/6/20272022-12-310001326003us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003us-gaap:TreasuryStockCommonMember2021-12-310001326003us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMember2022-12-310001326003Equity Securities | Diversified Financial Services2022-12-310001326003Debt Investments | Commercial Services & Supplies | Kellermeyer Bergensons Services, LLC | First Lien Delayed Draw Term Loan B | Quarterly LIBOR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.41% | Maturity 11/7/20262022-12-310001326003Debt Investments | Machinery Sonnys Enterprises, LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 10.99% | Maturity 8/5/20262022-12-310001326003us-gaap:GeographicConcentrationRiskMembercountry:CAbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMemberbkcc:FixedInterestRateMember2023-09-300001326003Debt Investments | Paper & Forest Products | Alpine Acquisition Corp II (48Forty) | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 5.75% | Total Coupon 11.43% | Maturity 11/30/20262023-09-300001326003Debt Investments | Diversified Financial Services | GC Champion Acquisition LLC (Numerix) | First Lien Term Loan | SOFR(S) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 11.28% | Maturity 8/21/20282023-09-300001326003Debt Investments | Machinery | Sonnys Enterprises, LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 12.27% | Maturity 8/5/20282023-09-3000013260032018-03-062018-03-060001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberbkcc:TrancheOneMember2023-01-012023-09-300001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMember2023-09-3000013260032020-05-010001326003us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2023-01-012023-09-300001326003bkcc:OilGasAndConsumableFuelsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:InvestmentAdvisorExpensesMember2022-07-012022-09-300001326003Debt Investments | Diversified Consumer Services | Fusion Holding Corp. (Finalsite) | First Lien Term Loan | Quarterly/Semiannually SOFR | | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.64% | Maturity 9/14/20292023-09-300001326003country:NLus-gaap:GeographicConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003us-gaap:SubsequentEventMember2023-11-060001326003Debt Investments | Insurance | Integrity Marketing Acquisition, LLC | First Lien Incremental Term Loan | SOFR(Q) | Floor rate 0.75% | Spread 6.50% | Total Coupon 11.92% | Maturity 8/27/20262023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:ElectricalEquipmentMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Equity Securities | Diversified Consumer Services | Elevate Brands Holdco Inc. | Warrants to Purchase Preferred Stock | Expiration 3/14/20322022-12-310001326003Debt Investments | Hotels, Restaurants & Leisure | Showtime Acquisition, L.L.C (World Choice) | First Lien Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 7.50% | Total Coupon 12.97% | Maturity 8/7/20282023-09-300001326003us-gaap:CommonStockMember2022-12-3100013260032022-04-012022-06-300001326003us-gaap:IncomeApproachValuationTechniqueMemberbkcc:BankDebtMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003Debt Investments | Professional Services | TLE Holdings, LLC | First Lien Delayed Draw Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 5.50% | Total Coupon 10.92% | Maturity 6/28/20242023-09-300001326003Debt Investments | Capital Markets | Pico Quantitative Trading, LLC | First Lien Term Loan (1.0% Exit Fee) | Quarterly SOFR | Floor Rate 1.5% | Spread 7.25% | Total Coupon 12.92% | Maturity 2/7/20252023-09-300001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberbkcc:TrancheTwoMember2023-01-012023-09-300001326003Debt Investments | Real Estate Management & Development | Greystone Select Company II, LLC (Passco) | First Lien Delayed Draw Term Loan | SOFR(M) | Floor Rate 1.50% | Spread 6.50% | Total Coupon 10.94% | Maturity 3/21/20272022-12-310001326003Debt Investments | Construction & Engineering | Sunland Asphalt & Construction, LLC | First Lien Term Loan | Semiannually LIBOR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.15% | Maturity 1/13/20262022-12-310001326003us-gaap:AccountingStandardsUpdate202006Member2022-01-010001326003bkcc:NonControlledNonAffiliatedInvestmentsMember2023-07-012023-09-300001326003Investment | Worldremit Group Limited (United Kingdom) | Warrants to Purchase Series D Stock | Initial Acquisition Date 2/11/20212022-01-012022-12-310001326003Debt Investments | Diversified Financial Services | Worldremit Group Limited (United Kingdom) | First Lien Term Loan (3.0% Exit Fee) | LIBOR(Q) | Floor Rate 1.00% | Spread 9.25% | Total Coupon 13.91% | Maturity 2/11/20252022-12-310001326003bkcc:BankDebtMember2022-04-012022-06-300001326003Debt Investments | Specialty Retail 2022-12-310001326003us-gaap:SubsequentEventMember2023-11-062023-11-060001326003Debt Investments | Diversified Consumer Services | Fusion Holding Corp. (Finalsite) | First Lien Revolver | Quarterly SOFR | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.78% | Maturity 9/15/20272022-12-310001326003us-gaap:IncomeApproachValuationTechniqueMemberbkcc:BankDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:EquitySecuritiesMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003us-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-12-310001326003bkcc:BankDebtMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003us-gaap:CommonStockMember2023-03-310001326003bkcc:DiversifiedConsumerServicesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Senior Secured Loan, First Lien2023-01-012023-09-300001326003Debt Investments | Professional Services | ICIMS, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 3.38% Cash + 3.88% PIK | Total Coupon 12.63% | Maturity 8/18/20282023-09-300001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMember2023-01-012023-09-300001326003Debt Investments | Diversified Financial Services | Wealth Enhancement Group, LLC | First Lien Revolver | SOFR(S) | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.44% | Maturity 10/4/20272022-12-310001326003us-gaap:FairValueInputsLevel3Member2023-01-012023-09-300001326003Debt Investments | Health Care Technology2023-06-300001326003Non-Controlled Affiliate Security | Kemmerer Holdings, LLC (WMLP) | Limited Liability Co. Interest2022-12-310001326003bkcc:MarchOneTwoThousandTwentyTwoMember2022-01-012022-03-310001326003Debt Investments | Internet Software & Services | Anaconda, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.50% | Total Coupon 11.86% | Maturity 8/22/20272022-12-310001326003bkcc:LeisureProductsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Internet Software & Services | Persado, Inc. | First Lien Delayed Draw Term Loan (6.575% Exit Fee) | SOFR(M) | Floor Rate 1.80% | Spread 7.50% | Total Coupon 12.83% | Maturity 6/10/20272023-09-300001326003us-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputEBITDAOrRevenueMultiplesMember2022-12-310001326003us-gaap:FairValueInputsLevel2Member2022-12-310001326003us-gaap:EquitySecuritiesMember2021-12-310001326003us-gaap:FairValueInputsLevel2Member2023-09-300001326003Cash and Investments2022-12-310001326003Debt Investments | Internet Software & Services | Persado, Inc. | First Lien Delayed Draw Term Loan (6.575% Exit Fee) | SOFR(M) | Floor Rate 1.80% | Spread 7.00% | Total Coupon 11.12% | Maturity 6/10/20272022-12-310001326003us-gaap:AdditionalPaidInCapitalMember2023-06-300001326003bkcc:BlackrockFinancialManagementIncorporationMember2023-07-012023-09-300001326003Debt Investments | Diversified Financial Services | Callodine Commercial Finance, LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 9.00% | Total Coupon 14.65% | Maturity 11/3/20252023-09-300001326003srt:MaximumMemberbkcc:BankDebtMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-12-310001326003Debt Investments | Software | Backoffice Associates Holdings, LLC (Syniti) | First Lien Revolver| PRIME| Floor Rate 1.00% | Spread 6.75%| Total Coupon 15.10% | Maturity 04/30/20262023-09-300001326003Debt Investments | Diversified Financial Services | Gordon Brothers Finance Company | Unsecured Debt | LIBOR(M) | Floor Rate 1.00% | Spread 11.00% | Total Coupon 17.38% | Maturity 10/31/20212022-12-310001326003bkcc:FivePointZeroZeroPercentConvertibleNotesDueTwoThousandTwentyTwoMember2017-06-130001326003Debt Investments | Software | Grey Orange Incorporated | First Lien Delayed Draw Term Loan (3.75% Exit Fee) | SOFR(Q) | Floor Rate 1.00% | Spread 7.25% | Total Coupon 11.55% | Maturity 5/6/20262022-12-310001326003Debt Investments | Trading Companies & Distributors | Blackbird Purchaser, Inc. (Ohio Transmission Corp.) | Second Lien Term Loan | LIBOR(M) | Floor Rate 0.75% | Spread 7.50% | Total Coupon 11.88% | Maturity 4/8/20272022-12-310001326003Debt Investments | Specialty Retail2023-09-300001326003srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2023-09-300001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMemberbkcc:FixedInterestRateMember2022-06-090001326003Debt Securities2022-12-310001326003Debt Investments | Building Products | Porcelain Acquisition Corporation (Paramount) | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 5.75% | Total Coupon 11.49% | Maturity 4/30/20272023-09-300001326003srt:MaximumMember2022-12-310001326003us-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberbkcc:BankDebtMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003Debt Investments | Diversified Consumer Services | SellerX Germany GmbH (Germany) | First Lien Delayed Draw Term Loan B | Quarterly SOFR | Spread 4.50% Cash and 4.50% PIK | Total Coupon 14.39% | Maturity 5/23/20262023-09-300001326003bkcc:ControlledInvestmentMember2023-07-012023-09-300001326003Debt Investments | Software | Kaseya Inc. | First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 3.75% Cash + 2.50% PIK | Total Coupon 11.62% | Maturity 6/25/20292023-09-300001326003Debt Investments | Health Care Technology | Gainwell Acquisition Corp. | Second Lien Term Loan | LIBOR(Q) | Floor rate 1.00% | Spread 8.00% | Total Coupon 11.74% | Maturity 10/2/20282022-12-310001326003bkcc:PreIncentiveFeeNetInvestmentIncomeBetweenOnePointSevenFiveAndTwoPointOneTwoPercentageOfNetAssetsMember2020-05-022020-05-020001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Preferred Stock2022-12-310001326003Investment Marsico Holdings, LLC | Limited Partnership/Limited Liability Company Interests | Initial Acquisition Date 11/28/20072022-01-012022-12-310001326003us-gaap:TreasuryStockCommonMember2023-09-300001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMember2022-01-012022-12-310001326003us-gaap:CommonStockMember2022-06-300001326003us-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2022-12-310001326003Debt Investments | Software | GTY Technology Holdings Inc. | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 2.58% Cash + 4.30% PIK | Total Coupon 11.40% | Maturity 7/9/20292022-12-310001326003Debt Investments | Real Estate Management & Development | Greystone Select Company II, LLC (Passco) | First Lien Term Loan | SOFR(M) | Floor Rate 1.50% | Spread 6.50% | Total Coupon 10.94% | Maturity 3/21/20272022-12-310001326003Debt Investments | IT Services | Ensono, Inc. | Second Lien Term Loan B | LIBOR(S) | Spread 8.00% | Total Coupon 13.15% | Maturity 5/28/20292022-12-310001326003us-gaap:InterestRateSwapMember2023-09-300001326003bkcc:SeniorSecuredLoanFirstLienMember2022-12-310001326003bkcc:SemiconductorsAndSemiconductorEquipmentMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003us-gaap:CommonStockMember2021-12-310001326003Debt Investments | Trading Companies & Distributors | Blackbird Purchaser, Inc. (Ohio Transmission Corp.) | Second Lien Term Loan | SOFR(M) | Floor Rate 0.75% | Spread 7.50% | Total Coupon 12.92% | Maturity 4/8/20272023-09-300001326003us-gaap:AdditionalPaidInCapitalMember2023-01-012023-03-310001326003bkcc:MediaMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:LimitedPartnershipOrLimitedLiabilityCompanyInterestsMember2023-09-300001326003srt:MaximumMember2023-09-060001326003Debt Investments | Diversified Consumer Services | Razor Group GmbH (Germany) | First Lien Sr Secured Convertible Term Loan | Fixed Spread 3.50% Cash and 3.50% PIK | Total Coupon 7.00% | Maturity 4/30/20252022-12-310001326003Debt Investments | Consumer Finance | Money Transfer Acquisition Inc. | First Lien Term Loan | Monthly SOFR | Floor Rate 1.00% | Spread 8.25% | Total Coupon 13.67% | Maturity 12/14/20272023-09-300001326003Debt Investments | IT Services | Madison Logic Holdings, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.58% | Maturity 12/29/20282022-12-310001326003srt:MaximumMemberbkcc:SeniorSecuredRevolvingCreditsFacilityMemberbkcc:LiborMember2022-12-3100013260032022-09-300001326003us-gaap:PreferredStockMember2022-12-310001326003Investment Grey Orange International Inc. | Warrants to Purchase Common Stock | Initial Acquisition Date 5/6/20222022-01-012022-12-310001326003us-gaap:RetainedEarningsMember2021-12-310001326003Equity Securities | Diversified Financial Services2023-09-300001326003bkcc:BankDebtMember2022-09-300001326003Equity Securities | Diversified Consumer Services | MXP Prime Platform GmbH (SellerX) (Germany) | Warrants to Purchase Preferred Series B Shares | Expiration 11/23/20282022-12-310001326003Investment | Worldremit Group Limited (United Kingdom) | Warrants to Purchase Series E Stock | Initial Acquisition Date 8/27/20212023-01-012023-09-300001326003us-gaap:FairValueInputsLevel3Member2022-07-012022-09-300001326003bkcc:SpecialtyRetailMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Life Sciences Tools & Services | Alcami Corporation | First Lien Revolver | SOFR(M) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 12.42% | Maturity 12/21/20282023-09-300001326003srt:MaximumMemberbkcc:SeniorSecuredRevolvingCreditFacility1Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-060001326003Debt Investments | Software | Kaseya Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 5.75% | Total Coupon 10.33% | Maturity 6/25/20292022-12-310001326003bkcc:TechnologyHardwareStorageAndPeripheralsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Professional Services2022-12-310001326003us-gaap:FairValueInputsLevel1Memberbkcc:BankDebtMember2022-12-310001326003us-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003country:NLus-gaap:GeographicConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Investment PerchHQ LLC | Warrants to Purchase Common Stock | Initial Acquisition Date 9/30/20222022-01-012022-12-310001326003bkcc:SeniorSecuredLoansMember2023-09-300001326003bkcc:LimitedPartnershipOrLimitedLiabilityCompanyInterestsMember2022-12-310001326003Debt Investments | Diversified Financial Services | Wealth Enhancement Group, LLC | First Lien Revolver | SOFR(S) | Floor Rate 1.00% | Spread 6.25% | Total Coupon 11.09% | Maturity 10/4/20272023-09-300001326003Debt Investments | Diversified Financial Services | 2-10 Holdco, Inc. | First Lien Revolver | SOFR(M) | Floor Rate 0.75% | Spread 6.00% | Total Coupon 11.42% | Maturity 3/26/20262023-09-300001326003Debt Investments | Commercial Services & Supplies | Kellermeyer Bergensons Services, LLC | First Lien Delayed Draw Term Loan A | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.52% | Maturity 11/7/20262023-09-300001326003bkcc:BlackrockFinancialManagementIncorporationMember2022-07-012022-09-300001326003Debt Investments | Commercial Services & Supplies | Pueblo Mechanical and Controls, LLC | First Lien Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 6.00% | Total Coupon 10.32% | Maturity 8/23/20282022-12-310001326003Debt Investments | Commercial Services & Supplies | Thermostat Purchaser III, Inc. (Reedy Industries) | Second Lien Delayed Draw Term Loan | Quarterly LIBOR | Floor Rate 0.75% | Spread 7.25% | Total Coupon 11.98% | Maturity 8/31/20292022-12-310001326003bkcc:MeasurementInputYieldMember2023-01-012023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:ITServicesMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Equity Securities | Household Durables | Stitch Holdings, L.P. | Limited Partnership/Limited Liability Company Interests2022-12-310001326003Debt Investments | Internet Software & Services | Bynder Bidco B.V. (Netherlands) | First Lien Revolver B | SOFR(Q) | Floor Rate 1.00% | Spread 7.25% | Total Coupon 12.60% | Maturity 1/26/20292023-09-300001326003Equity Securities | Chemicals2023-09-300001326003Debt Investments | Professional Services | DTI Holdco, Inc. (Epiq Systems, Inc.) | Second Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 7.75% | Total Coupon 11.84% | Maturity 4/26/20302022-12-310001326003Equity Securities | Diversified Consumer Services | Razor Group GmbH (Germany) | Warrants to Purchase Series C Shares | Expiration 4/28/20282022-12-310001326003Debt Investments | Software | Bluefin Holding, LLC (Allvue) | First Lien Revolver| Semiannually SOFR | Floor Rate 1.00% | Spread 7.25 | Total Coupon 12.72% | Maturity 9/12/20292023-09-300001326003bkcc:FivePointZeroZeroPercentConvertibleNotesDueTwoThousandTwentyTwoMember2023-01-012023-09-300001326003bkcc:AssetsUpToTwoHundredPercentageOfNetValueAssetMember2020-05-022020-05-020001326003us-gaap:OtherDebtSecuritiesMember2023-01-012023-09-300001326003us-gaap:FairValueInputsLevel1Memberus-gaap:OtherDebtSecuritiesMember2023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:HealthCareTechnologyMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Software | Integrate.com, Inc. (Infinity Data, Inc.) | First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 3.00% Cash + 3.00% PIK | Total Coupon 11.54% | Maturity 12/17/20272023-09-300001326003us-gaap:EquitySecuritiesMember2022-09-300001326003bkcc:BlackrockFinancialManagementIncorporationMember2022-01-012022-09-300001326003Debt Investments | Commercial Services & Supplies2022-12-310001326003Non-Controlled Affiliate Security | Kemmerer Holdings, LLC (WMLP) | Limited Liability Co. Interest2021-12-310001326003Investment Pico Quantitative Trading Holdings, LLC | Warrants to Purchase Membership Units | Initial Acquisition Date 2/7/20202022-01-012022-12-310001326003us-gaap:RetainedEarningsMember2023-01-012023-03-310001326003Debt Investments | Software | SEP Raptor Acquisition, Inc. (Loopio) (Canada) | First Lien Revolver | LIBOR(Q) | Floor Rate 1.00% | Spread 4.50% Cash + 3.00% PIK | Total Coupon 12.25% | Maturity 3/31/20272022-12-310001326003bkcc:LifeSciencesToolsAndServicesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003us-gaap:GeographicConcentrationRiskMembercountry:GBbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Construction & Engineering | Homerenew Buyer, Inc. (Project Dream) | First Lien Revolver | Monthly SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.12% | Maturity 11/23/20272022-12-310001326003us-gaap:TreasuryStockCommonMember2022-04-012022-06-300001326003bkcc:ControlledInvestmentMember2022-01-012022-09-300001326003Debt Investments | Consumer Finance2023-09-300001326003bkcc:DiversifiedFinancialServicesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Road & Rail| Motive Technologies, Inc. (fka Keep Truckin, Inc.)| First Lien Term Loan | Semiannually SOFR | Floor Rate 1.00% | Spread 7.25% | Total Coupon 13.17% | Maturity 04/08/20252023-09-300001326003us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003Equity Securities | Chemicals | AGY Equity, LLC | Class A Preferred Stock2023-09-300001326003Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Delayed Draw Term Loan, First Lien2023-01-012023-09-300001326003us-gaap:RetainedEarningsMember2023-07-012023-09-300001326003bkcc:IndustryConcentrationRiskMemberus-gaap:HealthcareSectorMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Software | GTY Technology Holdings Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 2.58% Cash + 4.30% PIK | Total Coupon 11.46% | Maturity 7/9/20292022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacilityMembersrt:MinimumMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-3000013260032022-03-310001326003Debt Investments | Diversified Consumer Services2022-12-310001326003Debt Investments | IT Services2023-09-300001326003Debt Investments | Software | Integrate.com, Inc. (Infinity Data, Inc.) | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 3.00% Cash + 3.00% PIK | Total Coupon 11.54% | Maturity 12/17/20272023-09-300001326003Debt Investments | Diversified Financial Services | GC Champion Acquisition LLC (Numerix) | First Lien Term Loan | SOFR(S) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 11.15% | Maturity 8/21/20282022-12-310001326003Debt Investments | Software | Aerospike, Inc.| First Lien Term Loan (0.50% Exit Fee)| Monthly SOFR | Floor Rate 1.00% | Spread 7.50% | Total Coupon 12.93% | Maturity 12/29/20252023-09-300001326003Debt Investments | Software | Bluefin Holding, LLC (BlackMountain) | Second Lien Term Loan | LIBOR(Q) | Spread 7.75% | Total Coupon 12.48% | Maturity 9/3/20272022-12-310001326003bkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Equity Securities | Chemicals2022-12-310001326003us-gaap:MeasurementInputEbitdaMultipleMember2023-01-012023-09-300001326003us-gaap:AdditionalPaidInCapitalMember2022-06-300001326003Debt Investments | IT Services | Avalara, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 7.25% | Total Coupon 12.64% | Maturity 10/19/20282023-09-300001326003bkcc:BlackrockTcpCapitalCorpMember2023-09-062023-09-060001326003srt:MaximumMembersrt:DirectorMember2023-11-070001326003Debt Investments | Internet Software & Services |e-Discovery Acquireco, LLC (Reveal) | First Lien Term Loan | SOFR(Q| Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.90% | Maturity 8/29/20292023-09-300001326003Debt Investments | Real Estate Management & Development2023-09-300001326003us-gaap:CommonStockMember2023-06-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:SoftwareMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003us-gaap:AdditionalPaidInCapitalMember2023-04-012023-06-300001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Common Stock2023-09-300001326003Debt Investments | Construction & Engineering | LJ Avalon Holdings, LLC (Ardurra) | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.77% | Maturity 2/1/20302023-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacilityMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-300001326003us-gaap:InterestRateSwapMember2022-12-310001326003Debt Investments | Professional Services | GI Consilio Parent, LLC | Second Lien Term Loan | LIBOR(M) | Floor Rate 0.50% | Spread 7.50% | Total Coupon 11.88% | Maturity 5/14/20292022-12-310001326003Debt Investments | Construction & Engineering | Vortex Companies, LLC | First Lien Revolver | Monthly SOFR/PRIME | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.73% | Maturity 9/4/20292023-09-300001326003us-gaap:OtherDebtSecuritiesMember2022-04-012022-06-300001326003Equity Securities | Diversified Financial Services | Gordon Brothers Finance Company | Preferred Stock | Total Coupon 13.50%2023-09-3000013260032023-07-012023-09-300001326003Debt Investments | Life Sciences Tools & Services | Alcami Corporation | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 12.42% | Maturity12/21/20282023-09-300001326003us-gaap:CommonStockMember2022-04-012022-06-300001326003us-gaap:FairValueInputsLevel2Member2022-07-012022-09-300001326003Debt Investments | Professional Services | JobandTalent USA, Inc. (United Kingdom) | First Lien Delayed Draw Term Loan (3.0% Exit Fee) | SOFR(M) | Floor Rate 1.00% | Spread 8.75% | Total Coupon 14.20% | Maturity 2/17/20252023-09-300001326003bkcc:ReimbursementExpensesMember2022-07-012022-09-300001326003us-gaap:GeographicConcentrationRiskMembercountry:DEbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Distributors| Colony Display LLC | First Lien Term Loan (15% Exit Fee) | Quarterly SOFR | Floor Rate 1.0 % | Spread 6.50% Cash + 3.00% PIK | Total Coupon 15.15% | Maturity 6/30/20262023-09-300001326003us-gaap:IncomeApproachValuationTechniqueMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003bkcc:FloatingRateMemberbkcc:SeniorSecuredLoansMember2023-09-300001326003us-gaap:AdditionalPaidInCapitalMember2023-07-012023-09-300001326003Debt Investments | Software | Zendesk, Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 6.50% | Total Coupon 11.04% | Maturity 11/22/20282022-12-310001326003Debt Investments | Commercial Services & Supplies | Kellermeyer Bergensons Services, LLC | First Lien Term Loan | Quarterly LIBOR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.41% | Maturity 11/7/20262022-12-310001326003Equity Securities | Chemicals | AGY Equity, LLC | Class B Preferred Stock2022-12-310001326003srt:MaximumMemberus-gaap:MeasurementInputRevenueMultipleMemberbkcc:MarketComparableCompaniesMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003Debt Investments | Software | Disco Parent, Inc. (Duck Creek Technologies)| First Lien Term Loan| Quarterly SOFR | Floor Rate 1.00% | Spread 7.50%| Total Coupon 12.92%| Maturity 3/30/20292023-09-300001326003Debt Investments | Construction & Engineering2022-12-310001326003Debt Investments | Hotels, Restaurants & Leisure | Showtime Acquisition, L.L.C. (World Choice) | First Lien Revolver | SOFR(Q) | Floor rate 1.00% | Spread 7.50% | Total Coupon 12.97% | Maturity 8/7/20282023-09-300001326003Debt Investments | Health Care Providers & Services | INH Buyer, Inc. (IMS Health) | First Lien Term Loan (1.5% Exit Fee) | SOFR(Q) | Floor Rate 1.00% | Spread 3.50% Cash + 3.50% PIK | Total Coupon 11.68% | Maturity 6/28/20282022-12-310001326003Controlled Affiliate Security2022-12-310001326003Debt Investments Capital Markets Pico Quantitative Trading, LLC First Lien Term Loan (1.0% Exit Fee) Quarterly SOFR Floor Rate 1.5% and Spread 7.25% with Total Coupon 11.98% Maturity 2/7/20252022-12-310001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Unsecured Debt2022-01-012022-12-310001326003us-gaap:FairValueInputsLevel2Member2023-07-012023-09-300001326003Equity Securities | Internet Software & Services | FinancialForce.com, Inc. | Warrants to Purchase Series C Preferred Stock | Expiration 1/30/20292022-12-310001326003Debt Investments | Software | Syntellis Parent, LLC (Axiom Software) | First Lien Term Loan | SOFR(M) | Floor Rate 0.75% | Spread 6.50% | Total Coupon 10.82% | Maturity 8/2/20272022-12-310001326003Debt Investments | Health Care Technology | ESO Solutions, Inc. | First Lien Term Loan | SOFR(Q) | Floor rate 1.00% | Spread 7.00% | Total Coupon 12.40% | Maturity 5/3/20272023-09-300001326003Debt Investments | Insurance | Peter C. Foy & Associates Insurance Services, LLC (PCF Insurance) | First Lien Term Loan | SOFR(M) | Floor rate 0.75% | Spread 6.00% | Total Coupon 11.43% | Maturity 11/1/20282023-09-300001326003Debt Investments | Software | Superman Holdings, LLC (Foundation Software) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.13% | Total Coupon 11.52% | Maturity 8/31/20272023-09-3000013260032023-01-012023-09-300001326003Debt Investments | Hotels, Restaurants & Leisure | OCM Luxembourg Baccarat Bidco S.A.R.L. (Interblock) (Slovenia) | First Lien Revolver | SOFR(M) | Floor rate 0.75% | Spread 6.25% | Total Coupon 11.08% | Maturity 6/3/20272023-09-300001326003bkcc:BankDebtMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-12-310001326003Debt Investments | Health Care Technology | Sandata Technologies, LLC | First Lien Term Loan | LIBOR(Q) | Spread 6.00% | Total Coupon 10.75% | Maturity 7/23/20242022-12-310001326003Debt Investments | Internet Software & Services | Anaconda, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.50% | Total Coupon 12.92% | Maturity 8/22/20272023-09-300001326003Controlled Affiliate Security2022-01-012022-12-310001326003Debt Investments | Software | Zendesk, Inc. | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 6.50% | Total Coupon 11.04% | Maturity 11/22/20282022-12-310001326003Debt Investments | Capital Markets2023-09-300001326003Debt Investments | Professional Services | JobandTalent USA, Inc. (United Kingdom) | First Lien Term Loan (3.0% Exit Fee) | SOFR(M) | Floor Rate 1.00% | Spread 8.75% | Total Coupon 14.20% | Maturity 2/17/20252023-09-300001326003us-gaap:FairValueInputsLevel2Memberus-gaap:OtherDebtSecuritiesMember2023-09-300001326003Debt Investments | Diversified Financial Services | Accordion Partners LLC | First Lien Revolver | Floor Rate 0.75% | Spread 6.25% |Total Coupon 10.83% | Maturity 8/29/20292022-12-310001326003Equity Securities | Diversified Financial Services | Worldremit Group Limited (United Kingdom) | Warrants to Purchase Series D Stock | Expiration 2/11/20312022-12-310001326003us-gaap:CommonStockMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2021-12-310001326003srt:MaximumMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberbkcc:SeniorSecuredRevolvingCreditsFacilityMember2023-04-260001326003Debt Investments | Semiconductors & Semiconductor Equipment2022-12-310001326003us-gaap:SubsequentEventMember2023-11-072023-11-070001326003us-gaap:OtherDebtSecuritiesMember2022-12-310001326003Debt Investments | Technology Hardware, Storage & Peripherals | SumUp Holdings Luxembourg S.A.R.L. (United Kingdom) | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 12.54% | Maturity 2/17/20262023-09-300001326003Debt Investments | Software | Disco Parent, Inc. (Duck Creek Technologies)| First Lien Revolver| Quarterly SOFR | Floor Rate 1.00% | Spread 7.50%| Total Coupon 12.92%| Maturity 3/30/20292023-09-300001326003us-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2022-12-310001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberus-gaap:DebtInstrumentRedemptionPeriodOneMember2022-06-092022-06-090001326003srt:MinimumMemberbkcc:BankDebtMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-12-310001326003us-gaap:IncomeApproachValuationTechniqueMembersrt:MinimumMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class A Preferred Stock2023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class A Preferred Stock2023-01-012023-09-300001326003us-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2023-09-300001326003Investment | Razor Group GmbH (Germany), | Warrants to Purchase Preferred Series A1 Shares | Initial Acquisition Date 4/28/20212023-01-012023-09-300001326003Debt Investments | Software | Integrate.com, Inc. (Infinity Data, Inc.) | First Lien Delayed Draw Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 3.00% Cash + 3.00% PIK | Total Coupon 10.28% | Maturity 12/17/20272022-12-310001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class C Common Stock2021-12-310001326003us-gaap:AdditionalPaidInCapitalMember2022-09-300001326003Debt Investments | Internet Software & Services | Sailpoint Technologies Holdings, Inc. | First Lien Term Loan | SOFR(M) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.58% | Maturity 8/16/20292022-12-310001326003Debt Investments | Internet Software & Services | Sailpoint Technologies Holdings, Inc. | First Lien Revolver | SOFR(M) | Floor Rate 0.75% | Spread 6.25% | TotalCoupon 11.58% | Maturity 8/16/20282023-09-300001326003Equity Securities | Software | Grey Orange International Inc. | Warrants to Purchase Common Stock | Expiration 5/6/20322022-12-310001326003Investment Stitch Holdings, L.P. | Limited Partnership Interests | Initial Acquisition Date 7/30/20212022-01-012022-12-3100013260032022-07-012022-09-300001326003Debt Investments | Health Care Providers & Services | Outcomes Group Holdings, Inc. | Second Lien Term Loan | SOFR(Q) | Spread 7.50% | Total Coupon 18.02% | Maturity 10/26/20262023-09-300001326003Debt Investments | IT Services | Madison Logic Holdings, Inc. | First Lien Term Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.58% | Maturity 12/30/20272022-12-310001326003srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2022-01-012022-09-300001326003us-gaap:CommonStockMember2023-09-300001326003Debt Investments | Software | GTY Technology Holdings Inc.| First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 0.75% Spread 2.58% Cash + 4.30% PIK | Total Coupon 12.27% | Maturity 7/9/20292023-09-300001326003Debt Investments | Capital Markets | Pico Quantitative Trading, LLC | First Lien Incremental Term Loan | Quarterly SOFR | Floor Rate 1.5% | Spread 7.25% | Total Coupon 12.88% | Maturity 2/7/20252023-09-300001326003Debt Investments | Diversified Financial Services | Wealth Enhancement Group, LLC | First Lien Revolver | SOFR(S) | Floor Rate 1.00% | Spread 6.25% | Total Coupon 10.77% | Maturity 10/4/20272023-09-300001326003Debt Investments | Diversified Consumer Services | Whele LLC (Perch) | First Lien Incremental Term Loan | Monthly SOFR | Floor Rate 1.00% | Spread 11.50% PIK | Total Coupon 16.95% | Maturity 10/15/20252023-09-300001326003Debt Investments | Consumer Finance | Freedom Financial Network Funding, LLC | First Lien Delayed Draw Term Loan | Semiannually SOFR | Floor Rate 1.00% | Spread 9.00% | Total Coupon 14.20% | Maturity 9/21/20272023-09-300001326003Debt Investments | Diversified Financial Services | Wealth Enhancement Group, LLC | First Lien Delayed Draw Term Loan | SOFR(S) | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.44% | Maturity 10/4/20272022-12-310001326003us-gaap:MeasurementInputRevenueMultipleMembersrt:MinimumMemberus-gaap:OtherDebtSecuritiesMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003srt:MaximumMemberbkcc:PreIncentiveFeeNetInvestmentIncomeBetweenOnePointSevenFiveAndTwoPointOneTwoPercentageOfNetAssetsMember2020-05-022020-05-020001326003bkcc:IndustryConcentrationRiskMemberbkcc:ChemicalsMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:ReimbursementExpensesMember2023-01-012023-09-300001326003Debt Investments | Media | Terraboost Media Operating Company, LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 12.04% | Maturity 8/23/20262023-09-300001326003us-gaap:GeographicConcentrationRiskMembercountry:CAbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Equity Securities | Diversified Consumer Services | Elevate Brands Holdco | Warrants to Purchase Elevate Preferred New Super Senior Shares | Expiration 7/25/20302023-09-300001326003Investment | Blackbird Holdco, Inc. (Ohio Transmission Corp.), | Preferred Stock | Initial Acquisition Date 12/14/20212023-01-012023-09-300001326003Non-Controlled Affiliate Security | Kemmerer Holdings, LLC (WMLP) | Limited Liability Co. Interest2023-09-300001326003Cash and Cash Equivalents2022-12-310001326003Debt Investments | Insurance | AmeriLife Holdings, LLC | First Lien Revolver | SOFR(Q) | Floor rate 0.75% | Spread 5.75% | Total Coupon 9.58% | Maturity 8/31/20282022-12-310001326003bkcc:BuildingProductsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Health Care Technology | ESO Solutions, Inc. | First Lien Revolver | SOFR(Q) | Floor rate 1.00% | Spread 7.00% | Total Coupon 12.33% | Maturity 5/3/20272023-09-300001326003Debt Investments | Construction & Engineering | CSG Buyer, Inc. (Core States) | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.65% | Maturity 3/31/20282023-09-300001326003us-gaap:RetainedEarningsMember2023-03-310001326003Non-Controlled Affiliate Security | Kemmerer Holdings, LLC (WMLP) | Limited Liability Co. Interest2022-01-012022-12-310001326003bkcc:EquityWarrantsOrOptionsMember2023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:MachinerySectorMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Wireless Telecommunication Services | OpenMarket, Inc. (Infobip) (United Kingdom) | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.90% | Maturity 9/17/20262023-09-300001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Preferred Stock2022-01-012022-12-310001326003Debt Investments | Software | Superman Holdings, LLC (Foundation Software) | First Lien 2023 Incremental Delayed Draw Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.13% | Total Coupon 11.52% | Maturity 8/31/20272023-09-300001326003bkcc:BankDebtMember2021-12-310001326003Debt Investments | Software | JOBVITE, Inc. (Employ, Inc.) | First Lien Term Loan | Semiannually SOFR | Floor Rate 0.75% | Spread 8.00% | Total Coupon 13.43% | Maturity 8/5/20282023-09-300001326003bkcc:SeniorSecuredLoansSecondOrOtherPriorityLienMember2022-12-310001326003Debt Investments | Internet & Catalog Retail2023-09-300001326003Debt Investments | Machinery | Sonnys Enterprises, LLC | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 12.27% | Maturity 8/5/20282023-09-300001326003Debt Investments | Commercial Services & Supplies2023-09-3000013260032021-07-012021-09-300001326003bkcc:InsuranceMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Software | Backoffice Associates Holdings, LLC (Syniti) | First Lien Revolver | PRIME | Floor Rate 1.00% | Spread 6.75% | Total Coupon 14.25% | Maturity 4/30/20262022-12-310001326003us-gaap:AdditionalPaidInCapitalMember2022-01-012022-03-310001326003Debt Investments | Software | SEP Raptor Acquisition, Inc. (Loopio) (Canada)| First Lien Term Loan| Quarterly SOFR | Floor Rate 1.00% | Spread 7.00%| Total Coupon 12.54%| Maturity 3/31/20272023-09-300001326003Debt Investments | Commercial Services & Supplies | Modigent, LLC (fka Pueblo Mechanical and Controls, LLC| First Lien Delayed Draw Term Loan| Quarterly SOFR | Floor Rate .75% | Spread 6.00% | Total Coupon 11.39% | Maturity 08/23/20282023-09-300001326003Non Controlled Affiliated Investments2023-09-300001326003srt:MinimumMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003us-gaap:TreasuryStockCommonMember2022-03-310001326003Debt Investments | Internet Software & Services | Oranje Holdco, Inc. (KnowBe4) | First Lien Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 7.75% | Total Coupon 123.12% | Maturity 2/1/20292023-09-300001326003us-gaap:GeographicConcentrationRiskMembercountry:USbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:InvestmentAdvisorExpensesMember2023-01-012023-09-300001326003Debt Investments | Insurance | Peter C. Foy & Associates Insurance Services, LLC (PCF Insurance) | First Lien Term Loan | SOFR(S) | Floor rate 0.75% | Spread 6.00% | Total Coupon 11.12% | Maturity 11/1/20282022-12-310001326003Debt Investments | Diversified Consumer Services | Thras.io, LLC) | First Lien Delayed Draw Term Loan | Quarterly SOFR | Spread 7.00% | Total Coupon 12.65% | Maturity 12/18/20262023-09-300001326003bkcc:EquityWarrantsOrOptionsMember2022-12-310001326003Debt Investments | Diversified Financial Services2022-12-310001326003bkcc:BuildingProductsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Software | Nvest, Inc. (SigFig) | First Lien Term Loan | | Semiannually SOFR | Floor Rate 1.00% | Spread 7.50% | Total Coupon 13.40% | Maturity 9/15/20252023-09-300001326003bkcc:HouseholdDurablesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Software | Elastic Path Software Inc. (Canada) | First Lien Delayed Draw Term Loan| Quarterly SOFR | Floor Rate 1.00% | Spread 7.50% | Total Coupon 13.18%| Maturity 1/6/20262023-09-300001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Common Stock2022-01-012022-12-310001326003Debt Investments | Software | Fusion Risk Management, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 3.25% Cash + 3.75% PIK | Total Coupon 11.40% | Maturity 8/30/20282022-12-310001326003us-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2023-01-012023-09-300001326003Debt Investments | Diversified Financial Services | Wealth Enhancement Group, LLC | First Lien Delayed Draw Term Loan | SOFR(Q)/(S) | Floor Rate 1.00% | Spread 6.25% | Total Coupon 10.77% | Maturity 10/4/20272023-09-300001326003bkcc:BankDebtMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMember2022-06-092022-06-090001326003bkcc:SeniorSecuredRevolvingCreditFacilityMembersrt:MinimumMember2023-09-300001326003us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacility1Member2023-09-300001326003Debt Investments | Health Care Equipment & Supplies | Zest Acquisition Corp. | Second Lien Term Loan | LIBOR(M) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.39% | Maturity 3/14/20262022-12-310001326003Debt Investments | Commercial Services & Supplies | Thermostat Purchaser III, Inc. (Reedy Industries) | Second Lien Term Loan | Quarterly LIBOR | Floor Rate 0.75% | Spread 7.25% | Total Coupon 11.98% | Maturity 8/31/20292022-12-310001326003bkcc:RealEstateManagementAndDevelopmentMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacilityMember2022-01-012022-12-310001326003Debt Investments | Professional Services | ICIMS, Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 6.75% | Total Coupon 11.02% | Maturity 8/18/20282022-12-310001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-06-092022-06-090001326003bkcc:BlackrockCapitalInvestmentAdvisorsLimitedLiabilityCorporationMember2023-09-300001326003us-gaap:OtherDebtSecuritiesMember2023-06-300001326003bkcc:NonControlledAffiliatedInvestmentsMember2022-01-012022-09-300001326003Debt Investments | Internet Software & Services | Quartz Holding Company (Quick Base) | Second Lien Term Loan | SOFR(M) | Spread 8.00% | Total Coupon 13.42% | Maturity 4/2/20272023-09-300001326003bkcc:AssetsUpToTwoHundredPercentageOfNetValueAssetMemberbkcc:TcpcAndTcpMergerAgreementMember2023-09-062023-09-060001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class B Preferred Stock2022-01-012022-12-310001326003bkcc:InsuranceMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Investment | Worldremit Group Limited (United Kingdom) | Warrants to Purchase Series D Stock | Initial Acquisition Date 2/11/20212023-01-012023-09-300001326003Debt Investments | Software | Fusion Risk Management, Inc. | First Lien Revolver | Quarterly SOFR | Floor Rate 1.00% | Spread 7.00% | Total Coupon 12.38% | Maturity 5/22/20292023-09-300001326003Investment | MXP Prime Platform GmbH (SellerX) (Germany), | Warrants to Purchase SellerX Common Shares | Initial Acquisition Date 7/25/20232023-01-012023-09-300001326003Debt Investments | Road & Rail | Motive Technologies, Inc. (fka Keep Truckin, Inc.) | First Lien Term Loan | SOFR(S) | Floor Rate 1.00% | Spread 7.25% | Total Coupon 11.03% | Maturity 4/8/20252022-12-310001326003bkcc:NonControlledNonAffiliatedInvestmentsMember2023-09-300001326003Debt Investments | IT Services | Avalara, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 7.25% | Total Coupon 11.83% | Maturity 10/19/20282022-12-310001326003us-gaap:FairValueInputsLevel1Member2022-12-310001326003Investment | Elevate Brands Holdco, | Warrants to Purchase Elevate Common Shares | Initial Acquisition Date 7/25/20232023-01-012023-09-300001326003Debt Investments | Construction & Engineering | Homerenew Buyer, Inc. (Project Dream) | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.50% | Total Coupon 12.02% | Maturity 11/23/20272023-09-300001326003Non-Controlled Affiliate Security | AGY Equity, LLC | Class A Preferred Stock2021-12-310001326003Debt Investments | Specialty Retail | Calceus Acquisition, Inc. (Cole Haan) | First Lien Term Loan B | LIBOR(Q) | Spread 5.50% | Total Coupon 10.23% | Maturity 2/12/20252022-12-310001326003bkcc:CapitalMarketsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:BankDebtMember2023-01-012023-09-300001326003bkcc:MarketQuotationsMemberbkcc:BankDebtMemberbkcc:MeasurementInputIndicativeBidOrAskQuotesMemberus-gaap:FairValueInputsLevel3Member2022-12-310001326003us-gaap:AdditionalPaidInCapitalMember2023-03-310001326003Debt Investments | Diversified Consumer Services | Thras.io, LLC | First Lien Delayed Draw Term Loan | Semiannually LIBOR | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.17% | Maturity 12/18/20262022-12-310001326003us-gaap:GeographicConcentrationRiskMembercountry:SIbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:CommercialServicesAndSuppliesMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003srt:MinimumMemberbkcc:SeniorSecuredRevolvingCreditFacility1Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-04-260001326003bkcc:UnsecuredDebtSecuritiesMember2023-09-300001326003us-gaap:RetainedEarningsMember2023-04-012023-06-300001326003Equity Securities | Chemicals | AGY Equity, LLC | Class A Preferred Stock2022-12-310001326003Debt Investments | Insurance | AmeriLife Holdings, LLC | First Lien Delayed Draw Term Loan | SOFR(S) | Floor rate 0.75% | Spread 5.75% | Total Coupon 10.62% | Maturity 8/31/20292023-09-300001326003Debt Investments | Life Sciences Tools & Services2023-09-300001326003bkcc:BankDebtMember2022-01-012022-09-300001326003Debt Investments | Paper & Forest Products | FSK Pallet Holding Corp. (Kamps) | First Lien Term Loan | SOFR(Q) | Floor Rate 1.25% | Spread 6.00% | Total Coupon 11.43% | Maturity 12/23/20262023-09-300001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberus-gaap:DebtInstrumentRedemptionPeriodThreeMember2022-06-092022-06-090001326003Debt Investments | Diversified Financial Services | GC Champion Acquisition LLC (Numerix) | First Lien Delayed Draw Term Loan | SOFR(S) | Floor Rate 1.00% | Spread 6.75% |Total Coupon 11.15% | Maturity 8/21/20282022-12-310001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Unsecured Debt2022-12-310001326003Debt Investments | Professional Services2023-09-300001326003Debt Investments | Professional Services | ICIMS, Inc. | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 3.38% Cash + 3.88% PIK | Total Coupon 11.52% | Maturity 8/18/20282022-12-310001326003us-gaap:IncomeApproachValuationTechniqueMemberus-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003Debt Investments | Insurance | IT Parent, LLC (Insurance Technologies) | First Lien Revolver | LIBOR(M)/Prime | Floor rate 1.00% | Spread 6.25% | Total Coupon 11.21% | Maturity 10/1/20262022-12-310001326003us-gaap:AdditionalPaidInCapitalMember2022-04-012022-06-300001326003us-gaap:OtherDebtSecuritiesMember2023-07-012023-09-300001326003Debt Investments2022-12-310001326003Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Delayed Draw Term Loan, First Lien2022-01-012022-12-310001326003Debt Investments | Professional Services | TLE Holdings, LLC | First Lien Delayed Draw Term Loan | LIBOR(M) | Floor Rate 1.00% | Spread 5.50% | Total Coupon 9.88% | Maturity 6/28/20242022-12-310001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberus-gaap:DebtInstrumentRedemptionPeriodFourMember2022-06-092022-06-090001326003Investments2023-09-300001326003Debt Investments | Diversified Consumer Services | Razor Group GmbH (Germany) | First Lien Sr Secured Convertible Term Loan | Fixed | Spread 3.50% Cash and 3.50% PIK | Total Coupon 7.00% | Maturity 4/30/20252023-09-300001326003us-gaap:IncomeApproachValuationTechniqueMembersrt:MaximumMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003us-gaap:EquitySecuritiesMember2022-07-012022-09-300001326003Debt Investments | Diversified Financial Services | Gordon Brothers Finance Company | Unsecured Debt | LIBOR (M) | Floor Rate 1.00% | Spread 11.00% | Total Coupon 18.43% | Maturity 10/31/20212023-09-300001326003us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputExpectedTermMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Member2022-01-012022-12-310001326003Debt Investments | Software | Bonterra LLC (fka CyberGrants Holdings, LLC) | First Lien Delayed Draw Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 7.25% | Total Coupon 12.64% | Maturity 9/8/20272023-09-300001326003Debt Investments | Automobiles | ALCV Purchaser, Inc. (AutoLenders) | First Lien Term Loan | Quarterly LIBOR | Floor Rate 1.00% | Spread 6.75% | Total Coupon 11.45% | Maturity 4/15/20262022-12-310001326003Debt Investments | IT Services | Serrano Parent, LLC (Sumo Logic) | First Lien Revolver | SOFR(Q) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.87% | Maturity 5/13/20302023-09-300001326003Debt Investments | Software | Kaseya Inc. | First Lien Revolver | Monthly SOFR | Floor Rate 0.75% | Spread 3.75% Cash + 2.50% PIK | Total Coupon 11.57% | Maturity 6/25/20292023-09-300001326003bkcc:BankDebtMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2022-12-310001326003Equity Securities | Capital Markets2022-12-310001326003us-gaap:IncomeApproachValuationTechniqueMemberus-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003bkcc:SeniorSecuredLoansMember2022-12-310001326003Debt Investments | Health Care Technology | CareATC, Inc. | First Lien Term Loan | LIBOR(Q) | Floor rate 1.00% | Spread 7.25% | Total Coupon 11.99% | Maturity 3/14/20242022-12-310001326003Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Delayed Draw Term Loan, First Lien2022-12-310001326003Investment | Marsico Holdings, LLC, | Limited Partnership/Limited Liability Company Interests | Initial Acquisition Date 11/28/20072023-01-012023-09-300001326003Non-Controlled Affiliate Security | Kemmerer Holdings, LLC (WMLP) | Limited Liability Co. Interest2023-01-012023-09-300001326003Debt Investments | Software | Zilliant Incorporated | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 6.00% | Total Coupon 11.32% | Maturity 12/21/20272023-09-300001326003Debt Investments | Construction & Engineering | Geo Parent Corporation | First Lien Term Loan | Semiannually SOFR | Spread 5.25% | Total Coupon 10.80% | Maturity 12/19/20252023-09-300001326003us-gaap:EquitySecuritiesMembersrt:MinimumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2023-09-300001326003bkcc:NonControlledAffiliatedInvestmentsMember2022-07-012022-09-300001326003srt:MaximumMemberbkcc:BankDebtMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2022-12-310001326003bkcc:ReimbursementExpensesMember2023-07-012023-09-300001326003bkcc:SeniorSecuredLoansMembersrt:MinimumMemberus-gaap:BaseRateMember2023-09-300001326003Debt Investments | Software2023-09-300001326003bkcc:SeniorSecuredLoansMember2022-12-310001326003srt:MinimumMemberbkcc:SeniorSecuredRevolvingCreditFacility1Member2023-09-062023-09-0600013260032022-01-012022-03-310001326003us-gaap:OtherDebtSecuritiesMember2022-06-300001326003bkcc:BlackrockCapitalInvestmentCorporationMembersrt:ScenarioForecastMember2024-08-312024-08-3100013260032023-09-300001326003us-gaap:GeographicConcentrationRiskMembercountry:SIbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:DistributorsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Containers & Packaging2023-09-300001326003Debt Investments | Commercial Services & Supplies | Modigent, LLC (fka Pueblo Mechanical and Controls, LLC| First Lien Term Loan| Quarterly SOFR | Floor Rate .75% | Spread 6.00% | Total Coupon 11.38% | Maturity 08/23/20282023-09-300001326003bkcc:ControlledInvestmentMember2023-09-300001326003Debt Investments | Internet Software & Services | Reveal Data Corporation et al | First Lien FILO Term Loan | SOFR(S) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 9.92% | Maturity 3/9/20282022-12-310001326003Debt Investments | Consumer Finance2022-12-310001326003Debt Investments | Software | Grey Orange Incorporated | First Lien Term Loan (3.75% Exit Fee) | SOFR(Q) | Floor Rate 1.00% | Spread 7.25% | Total Coupon 12.23% | Maturity 5/6/20262022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacility1Membersrt:MinimumMember2023-09-300001326003Debt Investments | Software | Grey Orange Incorporated | First Lien Term Loan (3.75% Exit Fee) | Quarterly SOFR | Floor Rate 1.00% | Spread 7.25% | Total Coupon 12.88% | Maturity 5/6/20262023-09-300001326003Debt Investments | Software | Integrate.com, Inc. (Infinity Data, Inc.) | First Lien Revolver | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 11.39% | Maturity 12/17/20272023-09-300001326003Debt Investments | Software | Zendesk, Inc. | First Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 6.50% | Total Coupon 11.04% | Maturity 11/22/20282022-12-310001326003Debt Investments | Software | AlphaSense, Inc.| First Lien Term Loan| Monthly SOFR | Floor Rate 1.00% | Spread 7.00% | Total Coupon 12.43% | Maturity 03/11/20272023-09-300001326003Debt Investments | Commercial Services & Supplies | Modigent, LLC (fka Pueblo Mechanical and Controls, LLC| First Lien Revolver| PRIME| Floor Rate .75% | Spread 5.00% | Total Coupon 13.50% | Maturity 08/23/20272023-09-300001326003Debt Investments | Diversified Financial Services | 2-10 Holdco, Inc. | First Lien Term Loan | Monthly SOFR | Floor Rate 0.75% | Spread 6.00% | Total Coupon 10.42% | Maturity 3/26/20262022-12-310001326003Equity Securities | Chemicals | AGY Equity, LLC | Class B Preferred Stock2023-09-300001326003us-gaap:TreasuryStockCommonMember2022-06-300001326003bkcc:PaperAndForestProductsMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003 Debt Investments | Internet Software & Services |e-Discovery Acquireco, LLC (Reveal) | First Lien Revolver | SOFR(Q| Floor Rate 1.00% | Spread 6.50% | Total Coupon 11.90% | Maturity 8/29/20292023-09-300001326003Debt Investments | Construction & Engineering CSG Buyer, Inc. (Core States) | First Lien Revolver | Quarterly SOFR | Floor Rate 1.00% | Spread 6.00% | Total Coupon 10.84% | Maturity 3/31/20282022-12-310001326003Investment | Elevate Brands Holdco Inc. | Warrants to Purchase Preferred Stock | Initial Acquisition Date 3/14/20222023-01-012023-09-300001326003us-gaap:PrepaidExpensesAndOtherCurrentAssetsMember2022-12-310001326003Debt Investments | Software | Aerospike, Inc. | First Lien Term Loan | LIBOR(M) | Floor Rate 1.00% | Spread 7.50% | Total Coupon 11.88% | Maturity 12/29/20252022-12-310001326003Debt Investments | Software | Grey Orange Incorporated | First Lien Delayed Draw Term Loan (3.75% Exit Fee) | Quarterly SOFR | Floor Rate 1.00% | Spread 7.25% | Total Coupon 12.58% | Maturity 5/6/20262023-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacility1Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-062023-09-060001326003us-gaap:OtherDebtSecuritiesMember2023-09-300001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Unsecured Debt2023-01-012023-09-300001326003Debt Investments | Media | Terraboost Media Operating Company, LLC | First Lien Term Loan | SOFR(Q) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 8.14 % | Maturity 8/23/20262022-12-310001326003Controlled Affiliate Security2023-09-300001326003srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2023-01-012023-09-300001326003Equity Securities | Metals & Mining | Kemmerer Holdings, LLC (WMLP) | Limited Partnership/Limited Liability Company Interests2022-12-310001326003Investment Blackbird Holdco, Inc. (Ohio Transmission Corp.) | Preferred Stock | Initial Acquisition Date 12/14/20212022-01-012022-12-310001326003bkcc:SeniorSecuredRevolvingCreditFacilityMember2023-01-012023-09-300001326003Debt Investments | Diversified Consumer Services | Fusion Holding Corp. (Finalsite) | First Lien Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.78% | Maturity 9/14/20292022-12-310001326003bkcc:NonControlledNonAffiliatedInvestmentsMember2022-01-012022-09-300001326003bkcc:AutomobilesSectorMemberbkcc:IndustryConcentrationRiskMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003bkcc:IndustryConcentrationRiskMemberbkcc:ChemicalsMemberbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberus-gaap:DebtInstrumentRedemptionPeriodTwoMember2022-06-092022-06-090001326003bkcc:FivePointZeroZeroPercentConvertibleNotesDueTwoThousandTwentyTwoMemberus-gaap:CommonStockMember2022-01-012022-12-310001326003Investment | Grey Orange International Inc., | Warrants to Purchase Common Stock | Initial Acquisition Date 5/6/20222023-01-012023-09-300001326003Investments2022-12-310001326003Debt Investments | Health Care Providers & Services | INH Buyer, Inc. (IMS Health) | First Lien Term Loan (1.5% Exit Fee) | SOFR(Q) | Floor Rate 1.00% | Spread 3.50% Cash + 3.50% PIK | Total Coupon 12.49% | Maturity 6/28/20282023-09-300001326003Debt Investments | Semiconductors & Semiconductor Equipment| Emerald Technologies (U.S.) AcquisitionCo, Inc | First Lien Term Loan | Quarterly SOFR | Floor Rate 1.00% | Spread 6.25% | Total Coupon 11.82% | Maturity 12/29/20272023-09-300001326003Controlled Affiliate Security | Gordon Brothers Finance Company | Preferred Stock2023-01-012023-09-300001326003Debt Investments | Diversified Consumer Services | SellerX Germany GmbH (Germany) | First Lien Term Loan Tranche A1 | Quarterly SOFR | Spread 4.50% Cash and 4.50% PIK | Total Coupon 14.39% | Maturity 5/23/20262023-09-300001326003us-gaap:IncomeApproachValuationTechniqueMembersrt:MaximumMemberbkcc:BankDebtMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2022-12-310001326003us-gaap:EquitySecuritiesMember2023-06-300001326003Debt Investments | Professional Services | JobandTalent USA, Inc. (United Kingdom) | First Lien Term Loan (3.0% Exit Fee) | SOFR(M) | Floor Rate 1.00% | Spread 8.75 % | Total Coupon 13.19% | Maturity 2/17/20252022-12-310001326003Debt Investments | Software | Zendesk, Inc. | First Lien Delayed Draw Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 3.50% Cash + 3.50% PIK | Total Coupon 12.15% | Maturity 11/22/20282023-09-300001326003Interest Rate Swap | Company Receives Fixed 2.633% | Company Pays Floating 1 Day SOFR | Counterparty CME | Maturity Date 6/9/2025 | Payment Frequency Annual2023-09-300001326003Debt Investments | Automobiles | ALCV Purchaser, Inc. (AutoLenders) | First Lien Revolver | SOFR(M) / SOFR(Q) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 12.22% | Maturity 4/15/20262023-09-300001326003Debt Investments | Containers & Packaging | BW Holding, Inc. (Brook & Whittle) | Second Lien Term Loan | Quarterly SOFR | Floor Rate 0.75% | Spread 7.50% | Total Coupon 13.07% | Maturity 12/14/20292023-09-300001326003Debt Investments | Health Care Technology | CareATC, Inc. | First Lien Revolver | LIBOR(S) | Floor rate 1.00% | Spread 7.25% | Total Coupon 9.73% | Maturity 3/14/20242022-12-3100013260032023-09-060001326003Debt Investments | Consumer Finance | Money Transfer Acquisition Inc. | First Lien Term Loan | Monthly SOFR | Floor Rate 1.00% | Spread 8.25% | Total Coupon 12.67% | Maturity 12/14/20272022-12-310001326003Restricted Securities2022-12-310001326003bkcc:PreIncentiveFeeNetInvestmentIncomeLessThanOnePointSevenFivePercentageOfNetAssetsMember2020-05-022020-05-020001326003Equity Securities | Diversified Consumer Services | MXP Prime Platform GmbH (SellerX) (Germany) | Warrants to Purchase SellerX Common Shares | Expiration 7/25/20302023-09-300001326003Debt Investments | Software | Aras Corporation |First Lien Revolver | LIBOR(S) | Floor Rate 1.00% | Spread 6.50% | Total Coupon 9.50% | Maturity 4/13/20272022-12-310001326003Debt Investments | Semiconductors & Semiconductor Equipment | Emerald Technologies (U.S.) AcquisitionCo, Inc | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 6.25% | Total Coupon 10.67% | Maturity 12/29/20272022-12-310001326003Investment Elevate Brands Holdco Inc. | Warrants to Purchase Common Stock | Initial Acquisition Date 3/14/20222022-01-012022-12-310001326003bkcc:SeniorSecuredLoansSecondOrOtherPriorityLienMember2023-09-300001326003bkcc:AnnualIncentiveFeeBasedOnCapitalGainsMember2020-05-022020-05-020001326003Debt Investments | Software | Zilliant Incorporated | First Lien Revolver | LIBOR(M) | Floor Rate 0.75% | Spread 6.00% | Total Coupon 10.35% | Maturity 12/21/20272022-12-310001326003Equity Securities | Diversified Consumer Services | Elevate Brands Holdco Inc. | Warrants to Purchase Common Stock | Expiration 3/14/20322022-12-310001326003Debt Investments | Software | SEP Eiger BidCo Ltd. (Beqom) (Switzerland)| First Lien Revolver| Quarterly SOFR | Floor Rate 1.00% | Spread 6.50%| Total Coupon 11.38% | Maturity 5/9/20282023-09-300001326003us-gaap:CommonStockMember2023-01-012023-03-310001326003Debt Investments | Internet & Catalog Retail | Syndigo, LLC | Second Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 8.00% | Total Coupon 13.67% | Maturity 12/14/20282023-09-300001326003us-gaap:CommonStockMember2022-09-300001326003bkcc:SystemicRiskMember2023-01-012023-09-300001326003Debt Investments | Real Estate Management & Development | Greystone Select Company II, LLC (Passco) | First Lien Term Loan | Monthly SOFR | Floor Rate 1.50% | Spread 6.50% | Total Coupon 11.93% | Maturity 3/21/20272023-09-300001326003us-gaap:AdditionalPaidInCapitalMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2022-01-012022-03-310001326003Debt Investments | Containers & Packaging | PVHC Holding Corp. | First Lien Term Loan | Quarterly LIBOR | Floor Rate 1.00% | Spread 4.75% | Total Coupon 9.48% | Maturity 8/2/20242022-12-310001326003Debt Investments | Diversified Financial Services | Accordion Partners LLC | First Lien Revolver | Quaterly SOFR | Floor Rate 0.75% | Spread 6.25% | Total Coupon 11.64% | Maturity 8/31/20282023-09-300001326003bkcc:ControlledInvestmentMember2022-07-012022-09-300001326003bkcc:SeniorSecuredRevolvingCreditFacilityMembersrt:MaximumMember2023-09-300001326003Debt Investments | Software | Aras Corporation | First Lien Term Loan | LIBOR(Q) |Floor Rate 1.00% | Spread 3.25% Cash + 3.75% PIK | Total Coupon 10.94% | Maturity 4/13/20222022-12-310001326003Debt Investments | Internet Software & Services | Astra Acquisition Corp. (Anthology) | Second Lien Term Loan | SOFR(Q) | Floor Rate 0.75% | Spread 8.88% | Total Coupon 14.53% | Maturity 10/25/20292023-09-300001326003Debt Investments | Real Estate Management & Development | Greystone Affordable Housing Initiatives, LLC | First Lien Delayed Draw Term Loan | LIBOR(S) | Floor Rate 1.25% | Spread 6.00% | Total Coupon 9.05% | Maturity 3/2/20262022-12-310001326003bkcc:UnsecuredSeniorNotesDueTwoThousandTwentyFiveMemberbkcc:TrancheOneMember2022-06-092022-06-090001326003Debt Investments | Commercial Services & Supplies | Pueblo Mechanical and Controls, LLC | First Lien Revolver | Quarterly SOFR | Floor Rate 0.75% | Spread 6.00% | Total Coupon 10.32% | Maturity 8/23/20272022-12-310001326003us-gaap:EquitySecuritiesMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003Debt Investments | Paper & Forest Products | Alpine Acquisition Corp II (48Forty) | First Lien Revolver | SOFR(M) | Floor Rate 1.00% | Spread 5.75% | Total Coupon 11.69% | Maturity 11/30/20262023-09-300001326003Debt Investments | Capital Markets2022-12-310001326003Debt Investments | Insurance | Integrity Marketing Acquisition, LLC | First Lien Incremental Revolver | SOFR(Q) | Floor rate 1.00% | Spread 6.50% | Total Coupon 11.92% | Maturity 8/27/20262023-09-3000013260032023-11-070001326003us-gaap:EquitySecuritiesMembersrt:MaximumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2023-09-300001326003bkcc:TwoThousandAndTwentyFivePrivatePlacementNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-300001326003bkcc:BlackrockFinancialManagementIncorporationMember2023-01-012023-09-300001326003bkcc:SeniorSecuredLoansMembersrt:MinimumMemberus-gaap:BaseRateMember2022-12-310001326003bkcc:BankDebtMembersrt:MinimumMemberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueInputsLevel3Memberbkcc:MeasurementInputImpliedVolatilityMember2022-12-310001326003Debt Investments | Professional Services | ICIMS, Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 6.75% | Total Coupon 12.14% | Maturity 8/18/20282023-09-300001326003Debt Investments | Diversified Financial Services | Worldremit Group Limited (United Kingdom) | First Lien Term Loan (3.0% Exit Fee) | SOFR(M)/(Q) | Floor Rate 1.00% | Spread 9.25% | Total Coupon 14.79% | Maturity 2/11/20252023-09-300001326003Debt Investments | Paper & Forest Products2023-09-300001326003bkcc:BankDebtMember2022-12-310001326003bkcc:PreIncentiveFeeNetInvestmentIncomeMoreThanTwoPointOneTwoPercentageOfNetAssetsMember2020-05-022020-05-020001326003Debt Investments | Health Care Providers & Services | Outcomes Group Holdings, Inc. | Second Lien Term Loan | SOFR(Q) | Floor rate 0.50% | Spread 7.50% | Total Coupon 12.05% | Maturity 10/26/20262022-12-310001326003bkcc:NonControlledNonAffiliatedInvestmentsMember2022-07-012022-09-300001326003Debt Investments | Real Estate Management & Development2022-12-310001326003us-gaap:IncomeApproachValuationTechniqueMemberbkcc:BankDebtMembersrt:MinimumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MeasurementInputDiscountRateMember2023-09-300001326003bkcc:AugustOneTwoThousandTwentyThreeMember2023-07-012023-09-300001326003us-gaap:EquitySecuritiesMemberus-gaap:MeasurementInputRevenueMultipleMembersrt:MaximumMemberbkcc:MarketComparableCompaniesMemberus-gaap:FairValueInputsLevel3Member2023-09-300001326003Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Delayed Draw Term Loan, First Lien2023-09-300001326003Debt Investments | Textiles, Apparel & Luxury Goods2023-09-300001326003us-gaap:RetainedEarningsMember2022-04-012022-06-300001326003Investment | SuCo Investors, LP (Suited Connector) | Warrants to Purchase Class A Units | Initial Acquisition Date 3/6/20232023-01-012023-09-300001326003bkcc:IndustryConcentrationRiskMemberus-gaap:HealthcareSectorMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-300001326003Debt Investments | Software | Bonterra LLC (fka CyberGrants Holdings, LLC) | First Lien Revolver| Quarterly SOFR | Floor Rate 0.75% | Spread 7.25% | Total Coupon 12.64% | Maturity 9/8/20272023-09-300001326003Debt Investments | Automobiles | ALCV Purchaser, Inc. (AutoLenders) | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 6.75% | Total Coupon 12.18% | Maturity 4/15/20262023-09-300001326003bkcc:BlackrockCapitalInvestmentAdvisorsLimitedLiabilityCorporationMember2022-12-310001326003Debt Investments | Hotels, Restaurants & Leisure | OCM Luxembourg Baccarat Bidco S.A.R.L. (Interblock) (Slovenia) | First Lien Term Loan | SOFR(Q) | Floor rate 0.75% | Spread 6.25% | Total Coupon 11.15% | Maturity 6/3/20272023-09-300001326003Debt Investments | Software | GTY Technology Holdings Inc. | First Lien Revolver | SOFR(Q) | Floor Rate 0.75% | Spread 6.25% | Total Coupon 10.83% | Maturity 7/9/20292022-12-310001326003us-gaap:GeographicConcentrationRiskMembercountry:CHbkcc:InvestmentsAtFairValueMember2022-01-012022-12-310001326003Debt Investments | Life Sciences Tools & Services | Alcami Corporation | First Lien Term Loan | SOFR(M) | Floor Rate 1.00% | Spread 7.00% | Total Coupon 11.42% | Maturity 12/21/20282022-12-310001326003Controlled Affiliate Security2023-01-012023-09-300001326003bkcc:BankDebtMember2022-06-3000013260032020-05-022020-05-020001326003bkcc:IndustryConcentrationRiskMemberbkcc:WirelessTelecommunicationServicesMemberbkcc:InvestmentsAtFairValueMember2023-01-012023-09-30xbrli:purebkcc:Investmentxbrli:sharesiso4217:USDiso4217:USDxbrli:sharesbkcc:Tranche