Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Adviser
Related Party Transaction [Line Items]
Total fees to Gladstone Securities	$ 1,937	$ 1,992	$ 5,827	$ 6,040
Base management fee \| Adviser
Related Party Transaction [Line Items]
Total fees to Gladstone Securities	1,937	1,992	5,827	6,040
Incentive fee \| Adviser
Related Party Transaction [Line Items]
Total fees to Gladstone Securities	3,174	0	3,174	0
Incentive fee waiver \| Adviser
Related Party Transaction [Line Items]
Total fees to Gladstone Securities	(3,174)	0	(3,174)	0
Administration fee
Related Party Transaction [Line Items]
Total fees to Gladstone Securities	693	650	2,136	1,863
Financing fees \| Gladstone Securities
Related Party Transaction [Line Items]
Total fees to Gladstone Securities	0	0	0	15
Total fees to Gladstone Securities \| Gladstone Securities
Related Party Transaction [Line Items]
Total fees to Gladstone Securities	$ 0	$ 0	$ 0	$ 15