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RELATED-PARTY TRANSACTIONS - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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Related Party Transactions [Abstract] |  |
Base management fee | $ 2,037,000 | $ 1,836,000
Incentive fee | 1,131,000 | 1,793,000
Other, net | 111,000 | 95,000
Total due to Adviser | 3,279,000 | 3,724,000
Administration fee | 463,000 | 411,000
Cumulative accrued but unpaid portion of prior Administration Fees | 185,000 | 89,000
Total due to Administrator | 648,000 | 500,000
Due to Gladstone Securities | 5,000 | 0
Total due to related parties | $ 3,932,000 | $ 4,224,000

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