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INVESTMENTS - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Aug. 31, 2022 USD ($) | Jul. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | May 31, 2022 USD ($) | May 31, 2014 USD ($) | Sep. 30, 2022 USD ($) industry state portfolioCompany | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) industry state portfolioCompany | Sep. 30, 2021 USD ($) | Mar. 31, 2022 USD ($) | Aug. 31, 2012 USD ($)
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  |  |  |  |  | $ 102,046 |  | $ 47,550 |  |  |
Success fee income |  |  |  |  |  |  | $ 1,733 |  | $ 2,650 | 6,733 |  | 4,682 |  |  |
Principal repayments of investments |  |  |  |  |  |  |  |  |  | 48,000 |  | 14,060 |  |  |
Cost |  |  |  |  |  |  | 703,218 |  |  | 703,218 |  |  | $ 669,248 | [1] |
Dividend income |  |  |  |  |  |  | $ 4,825 |  | $ 1,590 | $ 6,381 |  | $ 1,592 |  |  |
Number of investment portfolio company | portfolioCompany |  |  |  |  |  |  | 26 |  |  | 26 |  |  |  |  |
Number of states which have invested in the company location | state |  |  |  |  |  |  | 18 |  |  | 18 |  |  |  |  |
Number of industries that have made investments | industry |  |  |  |  |  |  | 15 |  |  | 15 |  |  |  |  |
Investments owned, fair value |  |  |  |  |  |  | $ 737,935 |  |  | $ 737,935 |  |  | 714,396 | [1] |
Uncollectible receivables allowance, minimum required day for uncollectible adjustment |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |
Gross receivables from portfolio companies |  |  |  |  |  |  | 2,100 |  |  | $ 2,100 |  |  | 1,700 |  |
Allowance for uncollectible receivables |  |  |  |  |  |  | 1,400 |  |  | 1,400 |  |  | 1,300 |  |
Investment Portfolio Benchmark | Customer Concentration Risk | Five Largest Portfolio Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments owned, fair value |  |  |  |  |  |  | 315,700 |  |  | $ 315,700 |  |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  |  | 42.80% |  |  |  |  |
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Common Stock Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[3],[4] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investments owned, fair value | [2],[3],[4] |  |  |  |  |  |  |  |  |  |  |  | 921 |  |
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 2,800 | [5],[6] |  | $ 2,800 | [5],[6] |  | 2,800 | [2],[3],[7] |
Investments owned, fair value |  |  |  |  |  |  | 2,800 | [5],[6] |  | 2,800 | [5],[6] |  | 2,800 | [2],[3],[7] |
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[3],[4] |  |  |  |  |  |  |  |  |  |  |  | 4,722 |  |
Investments owned, fair value | [2],[3],[4] |  |  |  |  |  |  |  |  |  |  |  | 14,746 |  |
Investment, Identifier [Axis]: B+T Group Acquisition, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[3],[7] |  |  |  |  |  |  |  |  |  |  |  | 14,000 |  |
Investments owned, fair value | [2],[3],[7] |  |  |  |  |  |  |  |  |  |  |  | 14,000 |  |
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(L) – Common Stock Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[6],[8],[9] |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Investments owned, fair value | [5],[6],[8],[9] |  |  |  |  |  | 58 |  |  | 58 |  |  |  |  |
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(L) – Term Debt 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[6] |  |  |  |  |  | 14,000 |  |  | 14,000 |  |  |  |  |
Investments owned, fair value | [5],[6] |  |  |  |  |  | 14,000 |  |  | 14,000 |  |  |  |  |
Investment, Identifier [Axis]: B+T Group Acquisition, Inc.– Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[6],[9] |  |  |  |  |  | 4,722 |  |  | 4,722 |  |  |  |  |
Investments owned, fair value | [5],[6],[9] |  |  |  |  |  | 6,342 |  |  | 6,342 |  |  |  |  |
Investment, Identifier [Axis]: Bassett Creek Services, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Success fee income |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |  |
Realized gain on preferred equity |  |  |  | 4,700 |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the sale of investments |  |  |  | 57,600 |  |  |  |  |  |  |  |  |  |  |
Principal repayments of investments |  |  |  | 48,000 |  |  |  |  |  |  |  |  |  |  |
Investment, Identifier [Axis]: Bassett Creek Services, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[4] |  |  |  |  |  |  |  |  |  |  |  | 4,900 |  |
Investments owned, fair value | [2],[4] |  |  |  |  |  |  |  |  |  |  |  | 17,150 |  |
Investment, Identifier [Axis]: Bassett Creek Services, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2] |  |  |  |  |  |  |  |  |  |  |  | 48,000 |  |
Investments owned, fair value | [2] |  |  |  |  |  |  |  |  |  |  |  | 48,000 |  |
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,653 | [5],[9] |  | 6,653 | [5],[9] |  | 6,653 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 27,980 | [5],[9] |  | 27,980 | [5],[9] |  | 21,485 | [2],[4] |
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 17,700 | [5] |  | 17,700 | [5] |  | 17,700 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 17,700 | [5] |  | 17,700 | [5] |  | 17,700 | [2] |
Investment, Identifier [Axis]: Brunswick Bowling Products, Inc. – Term Debt 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,850 | [5] |  | 6,850 | [5] |  | 6,850 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 6,850 | [5] |  | 6,850 | [5] |  | 6,850 | [2] |
Investment, Identifier [Axis]: Counsel Press, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,995 | [5],[9] |  | 6,995 | [5],[9] |  | 6,995 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 27,246 | [5],[9] |  | 27,246 | [5],[9] |  | 25,374 | [2],[4] |
Investment, Identifier [Axis]: Counsel Press, Inc. – Term Debt 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 21,100 | [5] |  | 21,100 | [5] |  | 21,100 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 21,100 | [5] |  | 21,100 | [5] |  | 21,100 | [2] |
Investment, Identifier [Axis]: Counsel Press, Inc. – Term Debt 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,400 | [5] |  | 6,400 | [5] |  | 6,400 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 6,400 | [5] |  | 6,400 | [5] |  | 6,400 | [2] |
Investment, Identifier [Axis]: Country Club Enterprises, LLC - Guaranty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [10] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investments owned, fair value | [10] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investment, Identifier [Axis]: Country Club Enterprises, LLC – Guaranty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [11] |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Investments owned, fair value | [11] |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Investment, Identifier [Axis]: Country Club Enterprises, LLC – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 1,500 | [12] |  | 1,500 | [12] |  | 1,500 | [13] |
Investments owned, fair value |  |  |  |  |  |  | 1,499 | [12] |  | 1,499 | [12] |  | 1,498 | [13] |
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc - Preferred Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[9] |  |  |  |  |  | 21,000 |  |  | 21,000 |  |  |  |  |
Investments owned, fair value | [5],[9] |  |  |  |  |  | 21,000 |  |  | 21,000 |  |  |  |  |
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc – Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5] |  |  |  |  |  | 800 |  |  | 800 |  |  |  |  |
Investments owned, fair value | [5] |  |  |  |  |  | 800 |  |  | 800 |  |  |  |  |
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5] |  |  |  |  |  | 38,250 |  |  | 38,250 |  |  |  |  |
Investments owned, fair value | [5] |  |  |  |  |  | 38,250 |  |  | 38,250 |  |  |  |  |
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  | $ 39,100 | $ 21,000 |  |  |  |  |  |  |  |  |  |  |
Investment, Identifier [Axis]: Diligent Delivery Systems – Common Stock Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 500 | [5],[9] |  | 500 | [5],[9] |  | 500 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 1,827 | [5],[9] |  | 1,827 | [5],[9] |  | 1,533 | [2],[4] |
Investment, Identifier [Axis]: Diligent Delivery Systems – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 12,996 | [12] |  | 12,996 | [12] |  | 12,987 | [13] |
Investments owned, fair value |  |  |  |  |  |  | 13,000 | [12] |  | 13,000 | [12] |  | 13,000 | [13] |
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 8,199 | [5],[6],[9] |  | 8,199 | [5],[6],[9] |  | 8,199 | [2],[3],[4],[7] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[6],[9] |  | 0 | [5],[6],[9] |  | 0 | [2],[3],[4],[7] |
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [3],[13] |  |  |  |  |  |  |  |  |  |  |  | 9,210 |  |
Investments owned, fair value | [3],[13] |  |  |  |  |  |  |  |  |  |  |  | 9,072 |  |
Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc.– Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[6] |  |  |  |  |  | 9,210 |  |  | 9,210 |  |  |  |  |
Investments owned, fair value | [5],[6] |  |  |  |  |  | 3,825 |  |  | 3,825 |  |  |  |  |
Investment, Identifier [Axis]: Educators Resource, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 8,560 | [5],[9] |  | 8,560 | [5],[9] |  | 8,560 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 18,937 | [5],[9] |  | 18,937 | [5],[9] |  | 19,252 | [2],[4] |
Investment, Identifier [Axis]: Educators Resource, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 20,000 | [5] |  | 20,000 | [5] |  | 20,000 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 20,000 | [5] |  | 20,000 | [5] |  | 20,000 | [2] |
Investment, Identifier [Axis]: Funko Acquisition Holdings, LLC – Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 21 | [6],[9],[14] |  | 21 | [6],[9],[14] |  | 30 | [3],[4],[15],[16] |
Investments owned, fair value |  |  |  |  |  |  | 58 | [6],[9],[14] |  | 58 | [6],[9],[14] |  | 74 | [3],[4],[15],[16] |
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 11,513 | [5],[9] |  | 11,513 | [5],[9] |  | 11,513 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 0 | [2],[4] |
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,500 | [5] |  | 6,500 | [5] |  | 6,500 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 6,102 | [5] |  | 6,102 | [5] |  | 6,500 | [2] |
Investment, Identifier [Axis]: Galaxy Technologies Holdings, Inc. – Term Debt 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 18,796 | [5] |  | 18,796 | [5] |  | 18,796 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 17,644 | [5] |  | 17,644 | [5] |  | 18,796 | [2] |
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000
Payment to extinguish secured borrowing liability |  | 5,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 8 | [5],[9] |  | 8 | [5],[9] |  | 8 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 0 | [2],[4] |
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 9,583 | [5],[9] |  | 9,583 | [5],[9] |  | 9,583 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 3,263 | [2],[4] |
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5] |  |  |  |  |  | 12,200 |  |  | 12,200 |  |  |  |  |
Investments owned, fair value |  |  |  |  |  |  | 12,200 | [5] |  | 12,200 | [5] |  | 13,300 | [3],[17] |
Investment, Identifier [Axis]: Gladstone SOG Investments, Inc. - Common Stock( |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[9] |  |  |  |  |  | 620 |  |  | 620 |  |  |  |  |
Investments owned, fair value | [5],[9] |  |  |  |  |  | 713 |  |  | 713 |  |  |  |  |
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 10,080 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 21,454 | [5],[9] |  | 21,454 | [5],[9] |  | 17,807 | [2],[4] |
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 57,700 | [5] |  | 57,700 | [5] |  | 27,700 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 57,700 | [5] |  | 57,700 | [5] |  | 27,700 | [2] |
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,749 | [5],[9] |  | 6,749 | [5],[9] |  | 6,749 | [2],[4],[7] |
Investments owned, fair value |  |  |  |  |  |  | 14,051 | [5],[9] |  | 14,051 | [5],[9] |  | 16,405 | [2],[4],[7] |
Investment, Identifier [Axis]: ImageWorks Display and Marketing Group, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 22,000 | [5] |  | 22,000 | [5] |  | 22,000 | [2],[7] |
Investments owned, fair value |  |  |  |  |  |  | 22,000 | [5] |  | 22,000 | [5] |  | 22,000 | [2],[7] |
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Guaranty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [7],[10] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investments owned, fair value | [7],[10] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 16,500 | [5],[18] |  | 16,500 | [5],[18] |  | 16,500 | [2],[7],[19] |
Investments owned, fair value |  |  |  |  |  |  | 10,900 | [5],[18] |  | 10,900 | [5],[18] |  | 15,023 | [2],[7],[19] |
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 26,000 |  |
Investments owned, fair value | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 23,672 |  |
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC - Term Debt 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 2,438 |  |
Investments owned, fair value | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 2,219 |  |
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[18] |  |  |  |  |  | 1,000 |  |  | 1,000 |  |  |  |  |
Investments owned, fair value | [5],[18] |  |  |  |  |  | 660 |  |  | 660 |  |  |  |  |
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[18] |  |  |  |  |  | 26,000 |  |  | 26,000 |  |  |  |  |
Investments owned, fair value | [5],[18] |  |  |  |  |  | 17,176 |  |  | 17,176 |  |  |  |  |
Investment, Identifier [Axis]: J.R. Hobbs Co. - Atlanta, LLC – Term Debt 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[18] |  |  |  |  |  | 2,438 |  |  | 2,438 |  |  |  |  |
Investments owned, fair value | [5],[18] |  |  |  |  |  | 1,610 |  |  | 1,610 |  |  |  |  |
Investment, Identifier [Axis]: J.R. Hobbs Co. – Atlanta, LLC – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 10,920 | [5],[9] |  | 10,920 | [5],[9] |  | 10,920 | [2],[4],[7] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 0 | [2],[4],[7] |
Investment, Identifier [Axis]: Mason West, LLC – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 11,206 | [5],[9] |  | 11,206 | [5],[9] |  | 11,206 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 5,615 | [5],[9] |  | 5,615 | [5],[9] |  | 7,553 | [2],[4] |
Investment, Identifier [Axis]: Mason West, LLC – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 25,250 | [5] |  | 25,250 | [5] |  | 25,250 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 25,250 | [5] |  | 25,250 | [5] |  | 25,250 | [2] |
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 0 | [5] |  | 0 | [5] |  | 0 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5] |  | 0 | [5] |  | 0 | [2] |
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,600 | [5],[9] |  | 6,600 | [5],[9] |  | 6,600 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 19,040 | [5],[9] |  | 19,040 | [5],[9] |  | 10,223 | [2],[4] |
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 34,050 | [5] |  | 34,050 | [5] |  | 27,700 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 34,050 | [5] |  | 34,050 | [5] |  | 27,700 | [2] |
Investment, Identifier [Axis]: Nth Degree Investment Group, LLC – Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 1,219 | [5],[9] |  | 1,219 | [5],[9] |  | 1,219 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 8,191 | [5],[9] |  | 8,191 | [5],[9] |  | 511 | [2],[4] |
Investment, Identifier [Axis]: Old World Christmas, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 0 | [2],[4],[7] |
Investments owned, fair value |  |  |  |  |  |  | 43,629 | [5],[9] |  | 43,629 | [5],[9] |  | 37,842 | [2],[4],[7] |
Investment, Identifier [Axis]: Old World Christmas, Inc. – Secured First Lien Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 25,000 | [5] |  | 25,000 | [5] |  | 25,000 | [2],[7] |
Investments owned, fair value |  |  |  |  |  |  | 25,000 | [5] |  | 25,000 | [5] |  | 25,000 | [2],[7] |
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[4],[7] |  |  |  |  |  |  |  |  |  |  |  | 19,730 |  |
Investments owned, fair value | [2],[4],[7] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Preferred Stock( |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[9] |  |  |  |  |  | 19,730 |  |  | 19,730 |  |  |  |  |
Investments owned, fair value | [5],[9] |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Investment, Identifier [Axis]: PSI Molded Plastics, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 26,618 | [5] |  | 26,618 | [5] |  | 26,618 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 23,642 | [5] |  | 23,642 | [5] |  | 26,618 | [2] |
Investment, Identifier [Axis]: Phoenix Door Systems, Inc – Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [12] |  |  |  |  |  | 2,550 |  |  | 2,550 |  |  |  |  |
Investments owned, fair value | [12] |  |  |  |  |  | 2,410 |  |  | 2,410 |  |  |  |  |
Investment, Identifier [Axis]: Phoenix Door Systems, Inc – Line of Credit, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [13] |  |  |  |  |  |  |  |  |  |  |  | 2,000 |  |
Investments owned, fair value | [13] |  |  |  |  |  |  |  |  |  |  |  | 1,920 |  |
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 1,452 | [5],[9] |  | 1,452 | [5],[9] |  | 1,452 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 0 | [2],[4] |
Investment, Identifier [Axis]: Phoenix Door Systems, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 3,200 | [12] |  | 3,200 | [12] |  | 3,200 | [13] |
Investments owned, fair value |  |  |  |  |  |  | 3,024 | [12] |  | 3,024 | [12] |  | 3,072 | [13] |
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 222 | [5],[9] |  | 222 | [5],[9] |  | 222 | [2],[4],[16] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 0 | [2],[4],[16] |
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 4,643 | [5],[9] |  | 4,643 | [5],[9] |  | 4,643 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 2,543 | [5],[9] |  | 2,543 | [5],[9] |  | 0 | [2],[4] |
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 3,128 | [5] |  | 3,128 | [5] |  | 3,128 | [13],[19] |
Investments owned, fair value |  |  |  |  |  |  | 3,128 | [5] |  | 3,128 | [5] |  | 2,909 | [13],[19] |
Investment, Identifier [Axis]: SFEG Holdings, Inc. – Term Debt 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 11,736 | [5] |  | 11,736 | [5] |  | 11,736 | [13],[19] |
Investments owned, fair value |  |  |  |  |  |  | 11,736 | [5] |  | 11,736 | [5] |  | 10,914 | [13],[19] |
Investment, Identifier [Axis]: Schylling, Inc. – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 4,000 | [5],[9] |  | 4,000 | [5],[9] |  | 4,000 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 16,475 | [5],[9] |  | 16,475 | [5],[9] |  | 17,820 | [2],[4] |
Investment, Identifier [Axis]: Schylling, Inc. – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 27,981 | [5] |  | 27,981 | [5] |  | 27,981 | [2] |
Investments owned, fair value |  |  |  |  |  |  | 27,981 | [5] |  | 27,981 | [5] |  | 27,981 | [2] |
Investment, Identifier [Axis]: The Maids International, LLC – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,640 | [5],[9] |  | 6,640 | [5],[9] |  | 6,640 | [2],[4],[7] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 2,679 | [2],[4],[7] |
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[7] |  |  |  |  |  |  |  |  |  |  |  | 28,560 |  |
Investments owned, fair value | [2],[7] |  |  |  |  |  |  |  |  |  |  |  | 28,560 |  |
Investment, Identifier [Axis]: The Maids International, LLC – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5] |  |  |  |  |  | 28,560 |  |  | 28,560 |  |  |  |  |
Investments owned, fair value | [5] |  |  |  |  |  | 28,560 |  |  | 28,560 |  |  |  |  |
Investment, Identifier [Axis]: The Mountain Corporation 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 3,400 |  |
Investments owned, fair value | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 3,400 |  |
Investment, Identifier [Axis]: The Mountain Corporation 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 800 |  |
Investments owned, fair value | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 800 |  |
Investment, Identifier [Axis]: The Mountain Corporation – Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 1 | [5],[9] |  | 1 | [5],[9] |  | 1 | [2],[4] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[9] |  | 0 | [5],[9] |  | 0 | [2],[4] |
Investment, Identifier [Axis]: The Mountain Corporation – Delayed Draw Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 1,500 | [5],[18] |  | 1,500 | [5],[18] |  | 1,500 | [2],[7],[19] |
Investments owned, fair value |  |  |  |  |  |  | 0 | [5],[18] |  | 0 | [5],[18] |  | 118 | [2],[7],[19] |
Investment, Identifier [Axis]: The Mountain Corporation – Line of Credit 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[18] |  |  |  |  |  | 3,400 |  |  | 3,400 |  |  |  |  |
Investments owned, fair value | [5],[18] |  |  |  |  |  | 2,411 |  |  | 2,411 |  |  |  |  |
Investment, Identifier [Axis]: The Mountain Corporation – Line of Credit 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[18] |  |  |  |  |  | 900 |  |  | 900 |  |  |  |  |
Investments owned, fair value | [5],[18] |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Investment, Identifier [Axis]: The Mountain Corporation – Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[4] |  |  |  |  |  |  |  |  |  |  |  | 6,899 |  |
Investments owned, fair value | [2],[4] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investment, Identifier [Axis]: The Mountain Corporation – Preferred Stock( |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[9] |  |  |  |  |  | 6,899 |  |  | 6,899 |  |  |  |  |
Investments owned, fair value | [5],[9] |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Investment, Identifier [Axis]: The Mountain Corporation – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 11,700 |  |
Investments owned, fair value | [2],[7],[19] |  |  |  |  |  |  |  |  |  |  |  | 923 |  |
Investment, Identifier [Axis]: The Mountain Corporation – Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5],[18] |  |  |  |  |  | 11,700 |  |  | 11,700 |  |  |  |  |
Investments owned, fair value | [5],[18] |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd. - Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 6,000 | [5],[9] |  | 6,000 | [5],[9] |  | 6,000 | [2],[4],[7] |
Investments owned, fair value |  |  |  |  |  |  | 5,118 | [5],[9] |  | 5,118 | [5],[9] |  | 6,000 | [2],[4],[7] |
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[7] |  |  |  |  |  |  |  |  |  |  |  | 18,250 |  |
Investments owned, fair value | [2],[7] |  |  |  |  |  |  |  |  |  |  |  | 18,250 |  |
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [2],[7] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investments owned, fair value | [2],[7] |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Investment, Identifier [Axis]: Utah Pacific Bridge & Steel, Ltd., 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | [5] |  |  |  |  |  | 18,250 |  |  | 18,250 |  |  |  |  |
Investments owned, fair value | [5] |  |  |  |  |  | 18,250 |  |  | 18,250 |  |  |  |  |
Secured First Lien Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 444,089 |  |  | 444,089 |  |  | 429,457 |  |
Investments owned, fair value |  |  |  |  |  |  | 420,907 |  |  | 420,907 |  |  | 425,087 |  |
Secured First Lien Debt | Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  | 12,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Secured First Lien Debt | Investment, Identifier [Axis]: Horizon Facilities Services, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  | 30,000 |  |  |  |  |  |  |  |  |  |  |  |
Secured First Lien Debt | Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  | $ 6,400 |  |  |  |  |  |  |  |  |  |
Preferred Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 149,099 |  |  | 149,099 |  |  | 143,079 |  |
Investments owned, fair value |  |  |  |  |  |  | 229,430 |  |  | 229,430 |  |  | 217,599 |  |
Preferred Equity | Investment, Identifier [Axis]: Horizon Facilities Services, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Success fee income |  |  | 1,700 |  |  |  |  |  |  |  |  |  |  |  |
Realized gain on preferred equity |  |  | 2,200 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from equity |  |  | 12,300 |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  | 10,100 |  |  |  |  |  |  |  |  |  |  |  |
Dividend income |  |  | $ 3,100 |  |  |  |  |  |  |  |  |  |  |  |
Secured Second Lien Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | 94,474 |  |  | 94,474 |  |  | 81,147 |  |
Investments owned, fair value |  |  |  |  |  |  | $ 76,751 |  |  | $ 76,751 |  |  | $ 67,958 |  |
Secured Second Lien Debt | Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |
Cost | [3],[17] | $ 13,300 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Cumulative gross unrealized appreciation for federal income tax purposes is $140.8 million; cumulative gross unrealized depreciation for federal income tax purposes is $97.1 million. Cumulative net unrealized appreciation is $43.8 million, based on a tax cost of $670.6 million.
[2] | Fair value was based on the total enterprise value of the portfolio company, which is generally allocated to the portfolio company’s securities in order of their relative priority in the capital structure. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[3] | One of our affiliated funds, Gladstone Capital Corporation, co-invested with us in this portfolio company pursuant to an exemptive order granted by the U.S. Securities and Exchange Commission.
[4] | Security is non-income producing.
[5] | Fair value was based on the total enterprise value of the portfolio company, which is generally allocated to the portfolio company’s securities in order of their relative priority in the capital structure. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[6] | One of our affiliated funds, Gladstone Capital Corporation, co-invested with us in this portfolio company pursuant to an exemptive order granted by the U.S. Securities and Exchange Commission.
[7] | Affiliate investments, as defined by the 1940 Act, are those that are not Control investments and in which we own, with the power to vote, between and inclusive of 5.0% and 25.0% of the issued and outstanding voting securities.
[8] | Affiliate investments, as defined by the 1940 Act, are those that are not Control investments and in which we own, with the power to vote, between and inclusive of 5.0% and 25.0% of the issued and outstanding voting securities.
[9] | Security is non-income producing.
[10] | Refer to Note 10—Commitments and Contingencies in the accompanying Notes to Consolidated Financial Statements for additional information regarding this guaranty.
[11] | Refer to Note 10—Commitments and Contingencies in the accompanying Notes to Consolidated Financial Statements for additional information regarding this guaranty.
[12] | Fair value was based on internal yield analysis or on estimates of value submitted by ICE Data Pricing and Reference Data, LLC. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[13] | Fair value was based on internal yield analysis or on estimates of value submitted by ICE Data Pricing and Reference Data, LLC. Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[14] | Our investment in Funko was valued using Level 2 inputs within the ASC 820 fair value hierarchy. Our common units in Funko are convertible into class A common stock in Funko, Inc. upon meeting certain requirements. Fair value was based on the closing market price of shares of Funko, Inc. as of the reporting date, less a discount for lack of marketability. Funko, Inc. is traded on the Nasdaq Global Select Market under the trading symbol “FNKO.” Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[15] | Our investment in Funko was valued using Level 2 inputs within the ASC 820 fair value hierarchy. Our common units in Funko are convertible into class A common stock in Funko, Inc. upon meeting certain requirements. Fair value was based on the closing market price of shares of Funko, Inc. as of the reporting date, less a discount for lack of marketability. Funko, Inc. is traded on the Nasdaq Global Select Market under the trading symbol “FNKO.” Refer to Note 3—Investments in the accompanying Notes to Consolidated Financial Statements for additional information.
[16] | Non-Control/Non-Affiliate investments, as defined by the 1940 Act, are those that are neither Control nor Affiliate investments and in which we own less than 5.0% of the issued and outstanding voting securities.
[17] | $5.1 million of the debt security was participated to a third-party, but is accounted for as collateral for a secured borrowing under accounting principles generally accepted in the U.S. and presented as Secured borrowing on our accompanying Consolidated Statements of Assets and Liabilities as of March 31, 2022.
[18] | Debt security is on non-accrual status.
[19] | Debt security is on non-accrual status.

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