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Holding Corp. Subordinated Loan2022-01-012022-09-300001487918MTE Holding Corp. Subordinated Loan2021-12-310001487918MTE Holding Corp. Subordinated Loan2022-09-300001487918MTE Holding Corp. Common Equity2022-01-012022-09-300001487918MTE Holding Corp. Common Equity2021-12-310001487918MTE Holding Corp. Common Equity2022-09-300001487918ofs:MTEHoldingCorpMember2022-01-012022-09-300001487918ofs:MTEHoldingCorpMember2022-09-300001487918Contract Datascan Holdings, Inc. Preferred Equity2022-01-012022-09-300001487918Contract Datascan Holdings, Inc. Preferred Equity2021-12-310001487918Contract Datascan Holdings, Inc. Preferred Equity2022-09-300001487918Contract Datascan Holdings, Inc. Common Equity2022-01-012022-09-300001487918Contract Datascan Holdings, Inc. Common Equity2021-12-310001487918Contract Datascan Holdings, Inc. Common Equity2022-09-300001487918ofs:ContractDatascanHoldingsIncMember2022-01-012022-09-300001487918DRF Imaging Services, LLC Common Equity2022-01-012022-09-300001487918DRF Imaging Services, LLC Common Equity2021-12-310001487918DRF Imaging Services, LLC Common Equity2022-09-300001487918Master Cutlery, LLC Subordinated Loan2022-01-012022-09-300001487918Master Cutlery, LLC Subordinated Loan2021-12-310001487918Master Cutlery, LLC Subordinated Loan2022-09-300001487918Master Cutlery, LLC Preferred Equity2022-01-012022-09-300001487918Master Cutlery, LLC Preferred Equity2021-12-310001487918Master Cutlery, LLC Preferred Equity2022-09-300001487918Master Cutlery, LLC Common Equity2022-01-012022-09-300001487918Master Cutlery, LLC Common Equity2021-12-310001487918Master Cutlery, LLC Common Equity2022-09-300001487918ofs:MasterCutleryLLCMember2022-01-012022-09-300001487918Pfanstiehl Holdings, Inc Common Equity2022-01-012022-09-300001487918Pfanstiehl Holdings, Inc Common Equity2021-12-310001487918Pfanstiehl Holdings, Inc Common Equity2022-09-300001487918TalentSmart Holdings, LLC Common Equity2022-01-012022-09-300001487918TalentSmart Holdings, LLC Common Equity2021-12-310001487918TalentSmart Holdings, LLC Common Equity2022-09-300001487918TRS Services, Inc. Preferred Equity2022-01-012022-09-300001487918TRS Services, Inc. Preferred Equity2021-12-310001487918TRS Services, Inc. Preferred Equity2022-09-300001487918TRS Services, Inc. Common Equity2022-01-012022-09-300001487918TRS Services, Inc. Common Equity2021-12-310001487918TRS Services, Inc. Common Equity2022-09-300001487918ofs:TRSServicesLLCMember2022-01-012022-09-300001487918us-gaap-supplement:InvestmentAffiliatedIssuerMember2022-01-012022-09-300001487918us-gaap-supplement:InvestmentAffiliatedIssuerMember2021-12-310001487918us-gaap-supplement:InvestmentAffiliatedIssuerMember2022-09-300001487918us-gaap:SubsequentEventMember2022-11-012022-11-010001487918ofs:ValuationProcessRiskMember2022-01-012022-09-300001487918ofs:FairValueDeterminationRiskMember2022-01-012022-09-30