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DERIVATIVE INSTRUMENTS - Schedule of Fair Value and Aggregate Unrealized Appreciation (Depreciation) (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Feb. 25, 2022
Dec. 23, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Unrealized Appreciation (Depreciation) $ (6,450,000) $ 3,440,000   $ 1,114,000 $ (10,320,000)      
MVC Credit Support Agreement                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Unrealized Appreciation (Depreciation)       3,200,000   $ (1,214,000)    
Sierra Credit Support Agreement                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Unrealized Appreciation (Depreciation)       (7,000,000)   (3,700,000)    
Barings LLC | MVC Credit Support Agreement                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Notional Amount 23,000,000     23,000,000   23,000,000   $ 23,000,000
Fair Value 16,800,000     16,800,000   12,386,000    
Unrealized Appreciation (Depreciation)     $ (1,214,000) 3,200,000   (1,214,000)    
Barings LLC | Sierra Credit Support Agreement                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Notional Amount 100,000,000     100,000,000   100,000,000 $ 100,000,000  
Fair Value $ 37,400,000     37,400,000   40,700,000    
Unrealized Appreciation (Depreciation)     $ (3,700,000) $ (7,000,000)   $ (3,700,000)