Annual report [Section 13 and 15(d), not S-K Item 405]

RELATED-PARTY TRANSACTIONS - Schedule of the Total Selling Commissions and Dealer-Manager Fees Paid (Details)

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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
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]      
Total due to related parties $ 1 $ 41 $ 583
Series E Preferred Stock | Preferred Stock      
Related Party Transaction [Line Items]      
Total due to related parties $ 1 $ 41 $ 583