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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2023 | Sep. 30, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Base management fee | 1.75% | 1.75% |  |  |
Base management fee, percent fee | 100.00% |  |  |  |
Management and service fee, net of credit | 0.50% | 0.50% |  |  |
Management and service fees, loans | 1.50% |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized | 7.99% | 7.87% |  |  |
Incentive fee base on minimum rate of return required on investment | $ 0 |  |  |  |
Percentage of pre-incentive fee net investment income is less than the hurdle rate | 100.00% |  |  |  |
Investment company, pre-incentive fee net investment income, percent threshold of net assets | 2.1875% |  | 2.50% |  |
Pre-incentive fee net investment income exceeds the hurdle rate | 20.00% |  |  |  |
Investment company, capital gains-based incentive fees | 20.00% |  |  |  |
Investment company, other operating expenses, due to advisor | $ 22,000 |  |  |  | $ 65,000
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Fee income | 55,000 | $ 16,000 |  |  |
Fees due to related party | 3,567,000 |  |  |  | 4,351,000
Related Party | Gladstone Investment Corporation |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Fees due to related party | $ 22,000 |  |  |  | $ 19,000
Adviser | Related Party | Chief Executive Officer |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  |  |  |
Administrator | Related Party | Chief Executive Officer |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  |  |  |
Gladstone Securities, LLC | Related Party | Chief Executive Officer |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  |  |  |
Maximum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Base management fee | 1.75% |  |  |  |
Minimum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized | 1.75% |  |  | 2.00% |

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