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DERIVATIVE INSTRUMENTS - Schedule of Fair Value and Aggregate Unrealized Appreciation (Depreciation) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Feb. 25, 2022 | Dec. 23, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Unrealized Appreciation (Depreciation) | $ 1,978,000 |  | $ (13,361,000) | $ 7,564,000 | $ (13,760,000) |  |  |
MVC Credit Support Agreement |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Unrealized Appreciation (Depreciation) |  |  |  | 2,050,000 |  | $ (1,214,000) |  |
Sierra Credit Support Agreement |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Unrealized Appreciation (Depreciation) |  |  |  | 600,000 |  | (3,700,000) |  |
Barings LLC | MVC Credit Support Agreement |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Notional Amount | 23,000,000 |  |  | 23,000,000 |  | 23,000,000 |  | $ 23,000,000
Fair Value | 15,650,000 |  |  | 15,650,000 |  | 12,386,000 |  |
Unrealized Appreciation (Depreciation) |  | $ (1,214,000) |  | 2,050,000 |  | (1,214,000) |  |
Barings LLC | Sierra Credit Support Agreement |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |
Notional Amount | 100,000,000 |  |  | 100,000,000 |  | 100,000,000 | $ 100,000,000 |
Fair Value | $ 45,000,000 |  |  | 45,000,000 |  | 40,700,000 |  |
Unrealized Appreciation (Depreciation) |  | $ (3,700,000) |  | $ 600,000 |  | $ (3,700,000) |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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