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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, 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

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