Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Schedule of Debt (Details)

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BORROWINGS - Schedule of Debt (Details) - USD ($)
Sep. 30, 2023
May 31, 2023
Mar. 31, 2023
Sep. 30, 2022
Aug. 31, 2021
Mar. 31, 2021
Debt Instrument [Line Items]            
Aggregate Principal Amount $ 416,538,000     $ 279,088,000    
Total borrowings $ 409,672,000   $ 292,607,000      
Indebtedness asset coverage on our senior securities 211.50%   244.70%      
Notes Payable            
Debt Instrument [Line Items]            
Notes Outstanding $ 13,489,500   $ 10,499,500      
Aggregate Principal Amount 337,238,000   262,488,000      
Less: Unamortized Discounts (6,774,000)   (5,052,000)      
Total borrowings $ 330,464,000   $ 257,436,000      
Notes Payable | 5.00% Notes due 2026            
Debt Instrument [Line Items]            
Interest Rate 5.00%   5.00%     5.00%
Notes Outstanding $ 5,117,500   $ 5,117,500      
Principal Amount per Note 25.00   25.00      
Aggregate Principal Amount $ 127,938,000   $ 127,938,000     $ 127,900,000
Notes Payable | 4.875% Notes due 2028            
Debt Instrument [Line Items]            
Interest Rate 4.875%   4.875%   4.875%  
Notes Outstanding $ 5,382,000   $ 5,382,000      
Principal Amount per Note 25.00   25.00      
Aggregate Principal Amount $ 134,550,000   $ 134,550,000   $ 134,600,000  
Notes Payable | 8.00% 2028 Notes            
Debt Instrument [Line Items]            
Interest Rate 8.00% 8.00%        
Notes Outstanding $ 2,990,000          
Principal Amount per Note 25.00          
Aggregate Principal Amount $ 74,750,000 $ 74,800,000