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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities $ 2,070 $ 2,939 $ 6,303 $ 7,236
Base management fee | Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 2,070 2,150 6,303 6,447
Incentive fee | Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 109 789 109 789
Incentive fee waiver | Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities (109) 0 (109) 0
Administration Fee        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 683 619 1,839 1,708
Financing Fees and Selling Commissions and Dealer Management Fees | Gladstone Securities        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 9 215 39 547
Selling Commissions and Dealer Management Fees | Gladstone Securities        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities $ 9 $ 215 $ 39 $ 547