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v3.23.2

RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 11, 2022 | May 31, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | 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% | 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 | 2.1875% |  | 8.77% | 4.69% | 8.32% | 6.88% |  | 2.50% | 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% |  | 2.50% |  |  | 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% |  |  |  |  |  |  | 10.00% | 9.75% |  |  |
Investment company, capital gains-based incentive fees |  |  | 20.00% |  | 20.00% |  |  |  |  |  |  |
Success fee income |  |  | $ 335,000 | $ 0 | $ 935,000 | $ 4,794,000 |  |  |  |  |  |
Investment company, other operating expenses, due to advisor |  |  | 63,000 |  | 63,000 |  |  |  |  |  |  | $ 44,000
Series A Preferred Stock | Dealer Manager Agreement |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 6,000,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 6.25% |  |  |  |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Success fee income |  |  | 500,000 | $ 200,000 | 800,000 | $ 800,000 |  |  |  |  |  |
Fees due to related party |  |  | 3,209,000 |  | 3,209,000 |  |  |  |  |  |  | 2,527,000
Related Party | Gladstone Investment Corporation |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fees due to related party |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  | $ 13,000
Adviser | Related Party | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |
Administrator | Related Party | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |
Gladstone Securities, LLC | Related Party | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |
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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