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)

v3.23.3
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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities $ 2,939 $ 2,591 $ 7,236 $ 7,801
Base management fee | Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 2,150 2,086 6,447 6,165
Incentive fee | Adviser        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 789 505 789 1,636
Administration Fee        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 619 543 1,708 1,470
Financing Fees and Selling Commissions and Dealer Management Fees | Gladstone Securities        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 215 5,069 547 11,232
Selling Commissions and Dealer Management Fees | Gladstone Securities        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 215 5,046 547 11,115
Financing fees        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities 0   0  
Financing fees | Gladstone Securities        
Related Party Transaction [Line Items]        
Total fees to Gladstone Securities $ 0 $ 23 $ 0 $ 117