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RELATED-PARTY TRANSACTIONS - Schedule of the Total Selling Commissions and Dealer-Manager Fees Paid (Details) - Selling Commissions and Dealer Management Fees - Gladstone Securities - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Related Party Transaction [Line Items] |  |
Total due to related parties | $ 0 | $ 28
Series E Preferred Stock | Preferred Stock |  |
Related Party Transaction [Line Items] |  |
Total due to related parties | $ 0 | $ 28

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