Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Schedule of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details)

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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities $ 2,076 $ 2,148 $ 4,233 $ 4,296
Base management fee | Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 2,076 2,148 4,233 4,296
Administration Fee        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 553 514 1,156 1,090
Financing Fees and Selling Commissions and Dealer Management Fees | Gladstone Securities        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 2 183 30 332
Selling Commissions and Dealer Management Fees | Gladstone Securities        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities $ 2 $ 183 $ 30 $ 332