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PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate Values of Level 3 Portfolio Investments Change (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period $ 844,733,638 $ 772,873,326  
Purchases of investments 187,469,608 211,010,869  
Payment-in-kind interest 3,799,843 1,357,177  
Sales and redemptions (137,816,595) (127,842,800)  
Realized (losses) gains $ (29,882,026) $ 3,772,512  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Realized Investment Gains (Losses) Realized Investment Gains (Losses)  
Change in unrealized (depreciation) appreciation included in earnings $ 2,792,152 $ (17,542,230)  
Change in unrealized (depreciation) appreciation on foreign currency included in earnings 614,520 (1,414,678)  
Amortization of premium and accretion of discount, net 2,749,543 2,519,462 $ 2,412,991
Fair value at end of period 874,460,683 844,733,638 772,873,326
Level 3 transfers 0 0  
Senior SecuredLoans-First Lien      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 735,555,508 646,352,935  
Purchases of investments 174,156,432 196,925,873  
Payment-in-kind interest 3,185,845 826,816  
Sales and redemptions (125,442,776) (98,160,329)  
Realized (losses) gains (11,200,184) (3,929,334)  
Change in unrealized (depreciation) appreciation included in earnings (4,667,866) (7,342,462)  
Change in unrealized (depreciation) appreciation on foreign currency included in earnings 610,523 (1,421,824)  
Amortization of premium and accretion of discount, net 2,591,838 2,303,833  
Fair value at end of period 774,789,320 735,555,508 646,352,935
Senior Secured Loans-Second Lien      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 45,304,300 56,733,110  
Purchases of investments   4,900,000  
Sales and redemptions (9,882,105) (10,809,276)  
Realized (losses) gains (17,979,749) (4,109,525)  
Change in unrealized (depreciation) appreciation included in earnings 4,373,111 (1,611,688)  
Amortization of premium and accretion of discount, net 141,943 201,679  
Fair value at end of period 21,957,500 45,304,300 56,733,110
Unsecured Debt      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 4,823,898 4,883,854  
Purchases of investments 62,086 83,511  
Payment-in-kind interest 613,998 530,361  
Sales and redemptions (211,627)    
Change in unrealized (depreciation) appreciation included in earnings 651,997 (687,778)  
Change in unrealized (depreciation) appreciation on foreign currency included in earnings 166    
Amortization of premium and accretion of discount, net 15,762 13,950  
Fair value at end of period 5,956,280 4,823,898 4,883,854
Equity Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 59,049,932 64,903,427  
Purchases of investments 13,251,090 9,101,485  
Sales and redemptions (2,280,087) (18,873,195)  
Realized (losses) gains (702,093) 11,811,371  
Change in unrealized (depreciation) appreciation included in earnings 2,434,910 (7,900,302)  
Change in unrealized (depreciation) appreciation on foreign currency included in earnings 3,831 7,146  
Fair value at end of period $ 71,757,583 $ 59,049,932 $ 64,903,427