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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024
Related Party Transaction [Line Items] |  |  |  |  |  |
Base management fee (as a percent) |  | 2.00% | 2.00% | 2.00% | 2.00% |
Base management fee, percent fee |  |  |  | 100.00% |  |
Investment company, excess expense reimbursable |  | $ 163,000 | $ 57,000 | $ 315,000 | $ 215,000 |
Maximum base management fee paid cannot exceed a percentage of total assets |  |  |  | 2.00% |  |
Ratio of net investment income (loss) to average net assets – annualized |  | (3.56%) | 4.73% | 4.18% | 1.32% |
Investment company, capital gains-based incentive fees |  |  |  | $ 4,900,000 |  | $ 1,100,000
Investment company, capital gains-based incentive fees payable (reversal) |  | $ 7,500,000 | $ (600,000) | 5,300,000 | $ 9,300,000 |
Accrued capital gains-based incentive fee |  | 42,100,000 |  | 42,100,000 |  | 36,700,000
Administration fee | [1] | 405,000 | 450,000 | 1,478,000 | 1,306,000 |
Success fee income |  | 843,000 | 1,382,000 | 2,546,000 | 1,382,000 |
Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Success fee income |  | 1,700,000 | $ 0 | 1,900,000 | $ 300,000 |
Due from related parties |  | $ 100,000 |  | 100,000 |  | $ 100,000
Affiliated Entity | Advisory Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
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% |  |
Pre-incentive fee net investment income exceeds the hurdle rate |  |  |  | 20.00% |  |
Investment company, capital gains-based incentive fees |  | 20.00% |  | 20.00% |  |
Affiliated Entity | Advisory Agreement | Minimum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized |  |  |  | 1.75% |  |
Adviser | Chief Executive Officer | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  | 100.00% |  | 100.00% |  |
Administrator | Chief Executive Officer | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  | 100.00% |  | 100.00% |  |
Gladstone Securities, LLC | Chief Executive Officer | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  | 100.00% |  | 100.00% |  |
[1] | Refer to Note 4 — Related Party Transactions in the accompanying Notes to Consolidated Financial Statements for additional information.

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