Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Revolving Credit Facility Narrative (Details)

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BORROWINGS - Revolving Credit Facility Narrative (Details) - Credit Facility - Line of Credit
 3 Months Ended 12 Months Ended
Jun. 16, 2023
USD ($)
Dec. 31, 2023
USD ($)
obligor
Sep. 30, 2023
USD ($)
Dec. 12, 2023
USD ($)
Dec. 31, 2022
obligor
Revolving Line of Credit - Amendment No. 5          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity       $ 233,700,000  
Line of credit facility, accordion feature maximum borrowing capacity       $ 350,000,000  
Revolving Line of Credit - Amendment No. 5 | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 0.10%        
Revolving Line of Credit - Amendment No. 5 | Secured Overnight Financing Rate (SOFR), Tranche One          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 3.00%        
Revolving Line of Credit - Amendment No. 5 | Secured Overnight Financing Rate (SOFR), Thereafter          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate 3.50%        
Revolving Line of Credit - Amendment No. 4          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 223,700,000        
Revolving Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 233,659,000 $ 223,659,000    
Debt instrument, covenant, borrowing base, minimum number of obligors | obligor   25      
Covenant, required minimum net worth of mandatory redeemable term preferred stock   $ 325,000,000      
Covenant, required minimum net worth of mandatory redeemable term preferred stock, plus percent of all equity and subordinated debt raised   50.00%      
Covenant, required minimum net worth of mandatory redeemable term preferred stock, minus percent of any equity or subordinated debt redeemed or retired   50.00%      
Covenant, required minimum net worth of mandatory redeemable term preferred stock, plus percent of all equity and subordinated debt raised, minus percent of any equity or subordinated debt redeemed or retired   $ 408,900,000      
Debt instrument, covenant, senior security, indebtedness, required minimum asset coverage ratio   150.00%      
Senior security, indebtedness, asset coverage amount   $ 670,100,000      
Indebtedness asset coverage on our senior securities   219.30%      
Investment company, number of obligor | obligor   36     36
Revolving Line of Credit | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate   3.10% 3.10%