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RELATED-PARTY TRANSACTIONS - Schedule of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Administration fee |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | $ 2,452 | $ 2,255 | $ 2,005
Financing Fees |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | 0 | 0 | 154
Adviser |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | 8,370 | 10,374 | 11,532
Adviser | Base management fee |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | 8,370 | 8,603 | 8,307
Adviser | Incentive fee |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | 109 | 1,771 | 3,225
Adviser | Incentive fee waiver |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | (109) | 0 | 0
Gladstone Securities | Financing Fees and Selling Commissions and Dealer Management Fees |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | 41 | 583 | 13,625
Gladstone Securities | Selling Commissions and Dealer Management Fees |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | 41 | 583 | 13,471
Gladstone Securities | Financing Fees |  |  |
Related Party Transaction [Line Items] |  |  |
Total fees to Gladstone Securities | $ 0 | $ 0 | $ 154

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