Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Fair Value Narrative (Details)

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BORROWINGS - Fair Value Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 10, 2023
Aug. 10, 2020
Jun. 30, 2023
Mar. 31, 2023
Debt Instrument [Line Items]        
Investments owned, fair value     $ 800,078 $ 753,543 [1]
Collateral Pledged        
Debt Instrument [Line Items]        
Investments owned, fair value     $ 701,100 $ 639,500
Revolving Line of Credit | Line of Credit        
Debt Instrument [Line Items]        
Unused fee percentage       1.00%
Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Unused fee percentage     1.00%  
Credit Facility | Revolving Line of Credit | Line of Credit | Secured Overnight Financing Rate (SOFR)        
Debt Instrument [Line Items]        
Debt instrument, variable rate floor   0.35% 0.35% 0.50%
Debt instrument, basis spread on variable rate 0.11% 0.11% 3.10%  
Credit Facility | Revolving Line of Credit | Line of Credit | LIBOR        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate       2.94%
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $150.4 million; cumulative gross unrealized depreciation for federal income tax purposes is $119.3 million. Cumulative net unrealized appreciation is $31.1 million, based on a tax cost of $722.4 million.