Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail)

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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Related Party Transactions [Abstract]      
Base management fee $ 8,307 $ 6,329 $ 4,289
Incentive fee 3,225 3,901 3,038
Total fees to our Adviser 11,532 10,230 7,327
Administration fee 2,005 1,526 1,448
Selling Commissions and Dealer-Manager Fees 13,471 4,961 4,711
Financing fees 154 166 262
Total fees to Gladstone Securities $ 13,625 $ 5,127 $ 4,973