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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended | 24 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 11, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2023 | Mar. 31, 2023 | Apr. 11, 2022 | Mar. 31, 2022 | Mar. 31, 2023 | Sep. 30, 2022
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 | 2.1875% | 7.87% | 7.22% |  |  | 2.4375% |  |  |
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% |  |  |  |  | 2.4375% |  |
Pre-incentive fee net investment income exceeds the hurdle rate |  | 20.00% |  |  |  |  |  |  |
Investment company, investment income (loss) ratio, before incentive allocation, annualized | 8.75% |  |  |  |  | 9.75% |  |  |
Investment company, capital gains-based incentive fees |  | 20.00% |  |  |  |  |  |  |
Success fee income |  | $ 0 | $ 1,563,000 |  |  |  |  |  |
Investment company, other operating expenses, due to advisor |  | 19,000 |  |  |  |  |  |  | $ 44,000
Fees due to related party |  | 3,655,000 |  |  |  |  |  |  | 2,527,000
Forecast |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized |  |  |  | 2.50% |  |  |  |  |
Investment company, pre-incentive fee net investment income, percent threshold of net assets |  |  |  |  | 2.50% |  |  |  |
Investment company, investment income (loss) ratio, before incentive allocation, annualized |  |  |  | 10.00% |  |  |  |  |
Gladstone Investment Corporation |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Fees due to related party |  | 16,000 |  |  |  |  |  |  | $ 13,000
Affiliated Entity |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Success fee income |  | $ 16,000 | $ 600,000 |  |  |  |  |  |
Adviser | David Gladstone | Chief Executive Officer |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  | 100.00% |  |  |  |  |  |  |
Administrator | David Gladstone | Chief Executive Officer |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  | 100.00% |  |  |  |  |  |  |
Gladstone Securities, LLC | David Gladstone | 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% |  |  |  |  |  |  |
Minimum | Forecast |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized |  |  |  |  |  |  |  | 2.00% |

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