Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail)

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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Related Party Transactions [Abstract]    
Base management fee $ 1,836,000 $ 1,130,000
Incentive fee 1,793,000 883,000
Other, net 95,000 18,000
Total due to Adviser 3,724,000 2,031,000
Administration fee 411,000 363,000
Cumulative accrued but unpaid portions of prior Administration Fees 89,000 75,000
Total due to Administrator 500,000 438,000
Total due to Gladstone Securities 0 15,000
Total due to related parties $ 4,224,000 $ 2,484,000