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RELATED-PARTY TRANSACTIONS - Schedule of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Adviser |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | $ 1,992 | $ 2,070 | $ 6,040 | $ 6,303
Base management fee | Adviser |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 1,992 | 2,070 | 6,040 | 6,303
Incentive fee | Adviser |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 0 | 109 | 0 | 109
Incentive fee waiver | Adviser |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 0 | (109) | 0 | (109)
Administration fee |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 650 | 683 | 1,863 | 1,839
Total fees to Gladstone Securities | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 0 | 9 | 15 | 39
Selling Commissions and Dealer Management Fees | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 0 | 9 | 0 | 39
Financing fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | 0 | 0 | 15 | 0
Financing fees | Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total fees to Gladstone Securities | $ 0 | $ 0 | $ 15 | $ 0

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