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Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Cost/Amortized Cost | $ 652,217 | $ 605,365
Fair Value | $ 576,478 | 549,985
KCAP Freedom 3 LLC |  |
Schedule of Investments [Line Items] |  |
Cost/Amortized Cost |  | 40,847
Fair Value |  | $ 35,841
Great Lakes KCAP F3C Senior, LLC | Subordinated Securities, Effective Interest 12.3%, 12/29 Maturity | KCAP Freedom 3 LLC |  |
Schedule of Investments [Line Items] |  |
Percentage Ownership by Joint Venture |  | 100.00%
Cost/Amortized Cost |  | $ 40,847
Fair Value |  | $ 35,841

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