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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2023 | Sep. 30, 2024
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% | 0.50% | 0.50% |  |  |
Management and service fees, loans |  |  | 1.50% |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized | 5.68% | 7.62% | 5.65% | 7.80% |  |  |
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% |  | 20.00% |  |  |  |
Capital gains-based incentive fee | $ 0 |  | $ 0 |  |  |  |
Investment company, net investment income to common stockholder distributions ratio, threshold | 100.00% | 100.00% | 100.00% | 100.00% |  |  |
Investment company, other operating expenses, due to advisor | $ 99,000 |  | $ 99,000 |  |  |  | $ 52,000
Gladstone Securities |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Selling commissions, percentage | 7.00% |  | 7.00% |  |  |  |
Dealer manager fees percentage | 3.00% |  | 3.00% |  |  |  |
Payments for selling commissions and dealer-manager fees | $ 200,000 | $ 200,000 | $ 400,000 | $ 200,000 |  |  |
Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Fee income | 200,000 | $ 100,000 | 400,000 | $ 100,000 |  |  |
Fees due to related party | 2,836,000 |  | 2,836,000 |  |  |  | 4,458,000
Related Party | Gladstone Investment Corporation |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Fees due to related party | $ 94,000 |  | $ 94,000 |  |  |  | $ 75,000
Total fees due to Adviser | Chief Executive Officer | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  | 100.00% |  |  |  |
Fee due to Administrator | Chief Executive Officer | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  | 100.00% |  |  |  |
Gladstone Securities, LLC | Chief Executive Officer | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  | 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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