| INVESTMENTS - Fair Value Measurement Inputs and Valuation Techniques (Details)$ in Thousands
 | Dec. 31, 2022  USD ($) | Sep. 30, 2022  USD ($) | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | $ 621,739 |  | $ 649,615 |  | 
| Investment, Identifier [Axis]: Leeds Novamark Capital I, L.P. – Limited Partnership Interest ($843 uncalled capital commitment |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 156 | [1],[2],[3],[4] | 6,397 | [5],[6],[7] | 
| Investment, Identifier [Axis]: Antenna Research Associates, Inc. – Common Equity Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 13,189 | [2],[3] | 13,734 | [6],[8] | 
| Investment, Identifier [Axis]: Engineering Manufacturing Technologies, LLC – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,613 | [2],[3] | 1,773 | [6],[8] | 
| Investment, Identifier [Axis]: Leeds Novamark Capital I, L.P |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 200 |  |  |  | 
| Investment, Identifier [Axis]: Ohio Armor Holdings, LLC – Common Equity |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 749 | [2],[3] | 1,017 | [6],[8] | 
| Investment, Identifier [Axis]: WorkforceQA, LLC – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 383 | [2],[3] | 456 | [6],[8] | 
| Investment, Identifier [Axis]: 8th Avenue Food & Provisions, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,998 | [9] | 3,020 | [10] | 
| Investment, Identifier [Axis]: ALS Education, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,985 | [11] | 0 | [12] | 
| Investment, Identifier [Axis]: ALS Education, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 19,215 | [11] | 19,468 | [12] | 
| Investment, Identifier [Axis]: Antenna Research Associates, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [2] | 21,892 |  | 21,973 |  | 
| Investment, Identifier [Axis]: Arc Drilling Holdings LLC – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3] | 0 | [6],[8] | 
| Investment, Identifier [Axis]: Arc Drilling Holdings LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [11] | 0 | [12] | 
| Investment, Identifier [Axis]: Arc Drilling Holdings LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 5,480 | [11] | 5,350 | [12] | 
| Investment, Identifier [Axis]: Axios Industrial Group, LLC – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 2,940 |  |  |  | 
| Investment, Identifier [Axis]: Axios Industrial Group, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[13] |  |  | 8,741 |  | 
| Investment, Identifier [Axis]: Axios Industrial Group, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 8,820 |  |  |  | 
| Investment, Identifier [Axis]: Axios Industrial Group, LLC– Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[13] |  |  | 2,914 |  | 
| Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(S) – Common Stock Warrant |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3],[14] | 25 | [6],[8],[15] | 
| Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(S) – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,104 | [11],[14] | 1,146 | [12],[15] | 
| Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(S) – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,137 | [2],[3],[14] | 2,718 | [6],[8],[15] | 
| Investment, Identifier [Axis]: B+T Group Acquisition, Inc.(S) – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 5,520 | [11],[14] | 5,730 | [12],[15] | 
| Investment, Identifier [Axis]: B. Riley Financial, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [16],[17] | 2,358 |  |  |  | 
| Investment, Identifier [Axis]: CHA Holdings, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,760 | [9],[18] | 2,700 | [10],[19] | 
| Investment, Identifier [Axis]: CPM Holdings, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 778 | [9] | 758 | [10] | 
| Investment, Identifier [Axis]: Café Zupas – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,970 | [11] | 1,958 | [12] | 
| Investment, Identifier [Axis]: Café Zupas – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 0 |  |  |  | 
| Investment, Identifier [Axis]: Café Zupas – Line of Credit, |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12] |  |  | 0 |  | 
| Investment, Identifier [Axis]: Café Zupas – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 23,460 | [11] | 23,313 | [12] | 
| Investment, Identifier [Axis]: Canopy Safety Brands, LLC – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,179 | [2],[3] | 647 | [6],[8] | 
| Investment, Identifier [Axis]: Canopy Safety Brands, LLC – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 798 | [2],[3] | 798 | [6],[8] | 
| Investment, Identifier [Axis]: Chinese Yellow Pages Company – Line of Credit, |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[20],[21] | 0 | [8],[22],[23] | 
| Investment, Identifier [Axis]: Circuitronics EMS Holdings LLC – Common Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [6],[8] |  |  | 0 |  | 
| Investment, Identifier [Axis]: DKI Ventures, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 4,407 | [11] | 4,554 | [12] | 
| Investment, Identifier [Axis]: Defiance Integrated Technologies, Inc. – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 71 | [2],[3] | 1,147 | [6],[8] | 
| Investment, Identifier [Axis]: Defiance Integrated Technologies, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 7,585 | [2] | 7,665 | [8] | 
| Investment, Identifier [Axis]: ENET Holdings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12] |  |  | 23,142 |  | 
| Investment, Identifier [Axis]: ENET Holdings, LLC – Term Debt 2 |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 21,620 |  |  |  | 
| Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc. (S) – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,452 | [11],[14],[24] | 2,550 | [8],[15] | 
| Investment, Identifier [Axis]: Edge Adhesives Holdings, Inc.(S) – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3],[14] | 0 | [6],[8],[15] | 
| Investment, Identifier [Axis]: Eegee’s LLC – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,865 | [11] | 2,910 | [12] | 
| Investment, Identifier [Axis]: Eegee’s LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [11] | 0 | [12] | 
| Investment, Identifier [Axis]: Eegee’s LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 16,235 |  |  |  | 
| Investment, Identifier [Axis]: Eegee’s LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12] |  |  | 16,490 |  | 
| Investment, Identifier [Axis]: Encore Dredging Holdings, LLC – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 4,935 | [11] | 4,885 | [12] | 
| Investment, Identifier [Axis]: Encore Dredging Holdings, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [11] | 0 | [12] | 
| Investment, Identifier [Axis]: Encore Dredging Holdings, LLC – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 4,915 | [2],[3] | 2,842 | [6],[8],[15] | 
| Investment, Identifier [Axis]: Encore Dredging Holdings, LLC – Term Debt 1 |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 23,197 | [11] | 22,962 | [12] | 
| Investment, Identifier [Axis]: Encore Dredging Holdings, LLC – Term Debt 2 |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 4,464 | [11] | 4,407 | [12] | 
| Investment, Identifier [Axis]: Engineering Manufacturing Technologies, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [11] | 0 | [12] | 
| Investment, Identifier [Axis]: Engineering Manufacturing Technologies, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12] |  |  | 22,134 |  | 
| Investment, Identifier [Axis]: Engineering Manufacturing Technologies, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 22,050 |  |  |  | 
| Investment, Identifier [Axis]: FES Resources Holdings LLC – Common Equity Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3] | 0 | [6],[8] | 
| Investment, Identifier [Axis]: FES Resources Holdings LLC – Preferred Equity Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3] | 0 | [6],[8] | 
| Investment, Identifier [Axis]: Fix-It Group, LLC – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 3,250 | [11] | 0 | [12],[19] | 
| Investment, Identifier [Axis]: Fix-It Group, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,000 | [11] | 0 | [12],[19] | 
| Investment, Identifier [Axis]: Fix-It Group, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 10,000 | [11] | 9,950 | [12],[19] | 
| Investment, Identifier [Axis]: Frontier Financial Group Inc. – Convertible Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 45 | [2],[17] | 55 | [8],[25] | 
| Investment, Identifier [Axis]: Frontier Financial Group Inc. – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3] | 0 | [6],[8] | 
| Investment, Identifier [Axis]: Frontier Financial Group Inc. – Preferred Stock Warrant |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3] | 0 | [6],[8] | 
| Investment, Identifier [Axis]: Funko Acquisition Holdings, LLC |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 31,000 |  | 58 |  | 
| Investment, Identifier [Axis]: Funko Acquisition Holdings, LLC(S) – Common Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 31 | [3],[14],[26] | 58 | [6],[15],[27] | 
| Investment, Identifier [Axis]: GFRC 360, LLC – Common Stock Warrants |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3] | 0 | [6],[8] | 
| Investment, Identifier [Axis]: GFRC 360, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 803 | [11] | 681 | [12] | 
| Investment, Identifier [Axis]: GFRC 360, LLC – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 636 | [2],[3] | 551 | [6],[8] | 
| Investment, Identifier [Axis]: GFRC 360, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 956 | [11] | 973 | [12] | 
| Investment, Identifier [Axis]: GSM MidCo LLC – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,595 | [2],[3] | 1,359 | [6],[8] | 
| Investment, Identifier [Axis]: Giving Home Health Care, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 28,512 | [11],[17] | 28,800 | [12],[25] | 
| Investment, Identifier [Axis]: Giving Home Health Care, LLC – Warrant |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 446 | [2],[3] | 19 | [6],[8] | 
| Investment, Identifier [Axis]: Gray Matter Systems, LLC – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,488 | [11],[17] | 2,481 | [12],[25] | 
| Investment, Identifier [Axis]: Gray Matter Systems, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,090 | [11],[17] | 2,084 | [12],[25] | 
| Investment, Identifier [Axis]: HH-Inspire Acquisition, Inc. – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 9,950 | [11] | 9,925 | [12],[19] | 
| Investment, Identifier [Axis]: HH-Inspire Acquisition, Inc. – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,493 | [11] | 1,489 | [12],[19] | 
| Investment, Identifier [Axis]: HH-Inspire Acquisition, Inc. – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 914 | [2],[3] | 945 | [6],[8] | 
| Investment, Identifier [Axis]: HH-Inspire Acquisition, Inc. – Term Debt 1 |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 15,920 | [11] | 15,880 | [12],[19] | 
| Investment, Identifier [Axis]: HH-Inspire Acquisition, Inc. – Term Debt 2 |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 7,960 | [11] | 7,940 | [12],[19] | 
| Investment, Identifier [Axis]: Imperative Holdings Corporation – Preferred Equity Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,954 | [2],[3] | 2,028 | [6],[8] | 
| Investment, Identifier [Axis]: Imperative Holdings Corporation – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 22,916 | [11] | 23,295 | [12] | 
| Investment, Identifier [Axis]: LWO Acquisitions Company LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [8],[28] |  |  | 0 |  | 
| Investment, Identifier [Axis]: Leeds Acquisition Holdings, LLC |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 200 |  | 6,400 |  | 
| Investment, Identifier [Axis]: Lonestar EMS, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [2],[17] | 3,396 |  |  |  | 
| Investment, Identifier [Axis]: Lonestar EMS, LLC – Common Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [2],[3] | 0 | [6],[8] | 
| Investment, Identifier [Axis]: Lonestar EMS, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [8],[25] |  |  | 3,030 |  | 
| Investment, Identifier [Axis]: MCG Energy Solutions, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12] |  |  | 0 |  | 
| Investment, Identifier [Axis]: MCG Energy Solutions, LLC – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 7,972 | [2] | 8,151 | [8] | 
| Investment, Identifier [Axis]: MCG Energy Solutions, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 19,325 | [11] | 19,779 | [12] | 
| Investment, Identifier [Axis]: NetFortris Corp. – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 264 | [2],[3] | 469 | [6],[8] | 
| Investment, Identifier [Axis]: Ohio Armor Holdings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 18,223 | [11] | 18,558 | [12] | 
| Investment, Identifier [Axis]: PIC 360, LLC – Common Equity Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 3,603 | [2],[3] | 3,454 | [6],[8] | 
| Investment, Identifier [Axis]: Pansophic Learning, Ltd. – Term Debt 1 |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 27,930 | [11] | 27,825 | [12] | 
| Investment, Identifier [Axis]: Pansophic Learning, Ltd. – Term Debt 2 |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 4,988 | [11] | 4,969 | [12] | 
| Investment, Identifier [Axis]: R2i Holdings, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [25],[29] |  |  | 829 |  | 
| Investment, Identifier [Axis]: R2i Holdings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [25],[29] |  |  | 18,000 |  | 
| Investment, Identifier [Axis]: Salt & Straw, LLC – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,145 | [11] | 0 | [12] | 
| Investment, Identifier [Axis]: Salt & Straw, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 780 | [11] | 800 | [12] | 
| Investment, Identifier [Axis]: Salvo Technologies, Inc. – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,430 | [2],[3] | 2,584 | [6],[8] | 
| Investment, Identifier [Axis]: Salvo Technologies, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[13] |  |  | 11,619 |  | 
| Investment, Identifier [Axis]: Salvo Technologies, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 11,264 |  |  |  | 
| Investment, Identifier [Axis]: Sea Link International IRB, Inc. – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 160 | [2],[3] | 153 | [6],[8] | 
| Investment, Identifier [Axis]: Sea Link International IRB, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 11,484 | [11],[17] | 11,074 | [12],[25] | 
| Investment, Identifier [Axis]: Sea Link International IRB, Inc.– Common Equity Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 169 | [2],[3] | 105 | [6],[8] | 
| Investment, Identifier [Axis]: Sokol & Company Holdings, LLC – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,701 | [2],[3] | 1,500 | [6],[8] | 
| Investment, Identifier [Axis]: Sokol & Company Holdings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[13] |  |  | 13,500 |  | 
| Investment, Identifier [Axis]: Sokol & Company Holdings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 13,264 |  |  |  | 
| Investment, Identifier [Axis]: SpaceCo Holdings, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,625 | [11],[18] | 1,886 | [12],[19] | 
| Investment, Identifier [Axis]: SpaceCo Holdings, LLC – Term Deb |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[19] |  |  | 31,481 |  | 
| Investment, Identifier [Axis]: SpaceCo Holdings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11],[18] | 30,440 |  |  |  | 
| Investment, Identifier [Axis]: Springfield, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 29,850 | [11] | 29,738 | [12] | 
| Investment, Identifier [Axis]: TNCP Intermediate HoldCo, LLC – Common Equity Units |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,594 | [2],[3] | 2,337 | [6],[8] | 
| Investment, Identifier [Axis]: TNCP Intermediate HoldCo, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 900 | [2],[17] | 1,000 | [8],[25] | 
| Investment, Identifier [Axis]: Tailwind Smith Cooper Intermediate Corporation – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 4,294 | [9] | 4,313 | [10] | 
| Investment, Identifier [Axis]: Targus Cayman HoldCo, Ltd. – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [6],[29],[30] |  |  | 7,978 |  | 
| Investment, Identifier [Axis]: Total Safety Holdings, LLC – Common Equity |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 44 | [2],[3] | 50 | [6],[8] | 
| Investment, Identifier [Axis]: Triple H Food Processors, LLC – Common Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 675 | [2],[3] | 672 | [6],[8] | 
| Investment, Identifier [Axis]: Triple H Food Processors, LLC – Preferred Stock |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 125 | [2],[3] | 120 | [6],[8] | 
| Investment, Identifier [Axis]: Turn Key Health Clinics, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 498 | [11] | 495 | [12] | 
| Investment, Identifier [Axis]: Turn Key Health Clinics, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 10,945 | [11] | 10,890 | [12] | 
| Investment, Identifier [Axis]: Unirac Holdings, Inc. – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[13] |  |  | 0 |  | 
| Investment, Identifier [Axis]: Unirac Holdings, Inc. – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[13] |  |  | 0 |  | 
| Investment, Identifier [Axis]: Unirac Holdings, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[13] |  |  | 15,000 |  | 
| Investment, Identifier [Axis]: Unirac, Inc. – Delayed Draw Term Loan |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 0 |  |  |  | 
| Investment, Identifier [Axis]: Unirac, Inc. – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 703 |  |  |  | 
| Investment, Identifier [Axis]: Unirac, Inc. – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 15,019 |  |  |  | 
| Investment, Identifier [Axis]: Viva Railings, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 0 | [11] | 0 | [12] | 
| Investment, Identifier [Axis]: Viva Railings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 21,500 |  |  |  | 
| Investment, Identifier [Axis]: Viva Railings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12] |  |  | 21,364 |  | 
| Investment, Identifier [Axis]: WB Xcel Holdings, LLC |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 5,835 | [2],[3] | 5,687 | [6],[8] | 
| Investment, Identifier [Axis]: WB Xcel Holdings, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 1,468 | [2] | 1,468 | [8] | 
| Investment, Identifier [Axis]: WB Xcel Holdings, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 9,900 | [2] | 9,925 | [8] | 
| Investment, Identifier [Axis]: WorkforceQA, LLC – Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [11] | 0 |  |  |  | 
| Investment, Identifier [Axis]: WorkforceQA, LLC – Term Debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 9,987 | [11],[31] | 9,975 | [12],[19],[32] | 
| Investment, Identifier [Axis]: WorkforceQA, LLC– Line of Credit |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value | [12],[19] |  |  | 0 |  | 
| Significant Unobservable Inputs (Level 3) |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 619,194 |  | 643,160 |  | 
| Significant Unobservable Inputs (Level 3) | Yield Analysis | Secured first lien debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 410,235 |  | 423,912 |  | 
| Significant Unobservable Inputs (Level 3) | Yield Analysis | Secured second lien debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | $ 97,340 |  | $ 97,472 |  | 
| Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured first lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.107 |  | 0.080 |  | 
| Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured first lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.349 |  | 0.295 |  | 
| Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured first lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.132 |  | 0.118 |  | 
| Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured second lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.114 |  | 0.115 |  | 
| Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured second lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.152 |  | 0.154 |  | 
| Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured second lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.141 |  | 0.138 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Secured first lien debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | $ 40,008 |  | $ 39,946 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Secured second lien debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 7,585 |  | 7,665 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Unsecured debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 45 |  | 55 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Preferred and common equity / equivalents |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | $ 54,151 |  | $ 63,319 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured first lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 4.7 |  | 4.8 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured first lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 6.6 |  | 6.7 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured first lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 6.1 |  | 6.2 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured second lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 5.6 |  | 5.6 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured second lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 5.6 |  | 5.6 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured second lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 5.6 |  | 5.6 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Preferred and common equity / equivalents | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 4 |  | 4.1 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Preferred and common equity / equivalents | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 10.8 |  | 11 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Preferred and common equity / equivalents | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 6.5 |  | 6.5 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured first lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | $ 862 |  | $ 800 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured first lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 10,103 |  | 10,257 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured first lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 7,352 |  | 7,605 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured second lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,996 |  | 3,299 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured second lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,996 |  | 3,299 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured second lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 2,996 |  | 3,299 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Preferred and common equity / equivalents | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 862 |  | 800 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Preferred and common equity / equivalents | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 80,276 |  | 74,512 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Preferred and common equity / equivalents | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | $ 9,873 |  | $ 11,742 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Secured first lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.3 |  | 0.3 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Secured first lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.6 |  | 0.6 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Secured first lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.4 |  | 0.5 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Unsecured debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 1.3 |  | 0.3 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Unsecured debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 1.3 |  | 1.3 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Unsecured debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 1.3 |  | 1 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Preferred and common equity / equivalents | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.3 |  | 0.3 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Preferred and common equity / equivalents | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 4.4 |  | 4.4 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Preferred and common equity / equivalents | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 1.5 |  | 1.4 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Secured first lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | $ 12,908 |  | $ 11,514 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Secured first lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 15,526 |  | 16,320 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Secured first lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 14,543 |  | 14,656 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Unsecured debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 6,125 |  | 764 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Unsecured debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 6,125 |  | 11,514 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Unsecured debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 6,125 |  | 4,249 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Preferred and common equity / equivalents | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 3,130 |  | 764 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Preferred and common equity / equivalents | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 43,117 |  | 42,926 |  | 
| Significant Unobservable Inputs (Level 3) | TEV | Revenue | Preferred and common equity / equivalents | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | 20,544 |  | 19,963 |  | 
| Significant Unobservable Inputs (Level 3) | Market Quote | Secured second lien debt |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Investments owned, fair value |  | $ 9,830 |  | $ 10,791 |  | 
| Significant Unobservable Inputs (Level 3) | Market Quote | IBP | Secured second lien debt | Minimum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.543 |  | 0.820 |  | 
| Significant Unobservable Inputs (Level 3) | Market Quote | IBP | Secured second lien debt | Maximum |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.975 |  | 0.950 |  | 
| Significant Unobservable Inputs (Level 3) | Market Quote | IBP | Secured second lien debt | Weighted Average |  |  |  |  |  | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  | 
| Fair value, measurement input |  | 0.788 |  | 0.865 |  | 
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