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PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate Values of Level 3 Portfolio Investments Change (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period $ 772,873,326 $ 653,424,495  
Purchases of investments 211,010,869 389,414,531  
Payment-in-kind interest 1,357,177 939,030  
Sales and redemptions (127,842,800) (290,076,916)  
Realized gains (losses) $ 3,772,512 $ 23,687,355  
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 $ (17,542,230) $ (6,928,160)  
Change in unrealized (depreciation) appreciation on foreign currency included in earnings (1,414,678)    
Amortization of premium and accretion of discount, net (2,519,462) (2,412,991) $ (2,098,788)
Fair value at end of period 844,733,638 772,873,326 653,424,495
Level 3 transfers 0    
Senior SecuredLoans-First Lien      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 646,352,935 508,673,064  
Purchases of investments 196,925,873 354,637,555  
Payment-in-kind interest 826,816 521,595  
Sales and redemptions (98,160,329) (214,319,978)  
Realized gains (losses) (3,929,334) 1,475,577  
Change in unrealized (depreciation) appreciation included in earnings (7,342,462) (6,821,212)  
Change in unrealized (depreciation) appreciation on foreign currency included in earnings (1,421,824)    
Amortization of premium and accretion of discount, net (2,303,833) (2,186,334)  
Fair value at end of period 735,555,508 646,352,935 508,673,064
Senior Secured Loans-Second Lien      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 56,733,110 70,720,186  
Purchases of investments 4,900,000 965,250  
Sales and redemptions (10,809,276) (13,161,428)  
Realized gains (losses) (4,109,525) (1,781,665)  
Change in unrealized (depreciation) appreciation included in earnings (1,611,688) (157,390)  
Amortization of premium and accretion of discount, net (201,679) (148,157)  
Fair value at end of period 45,304,300 56,733,110 70,720,186
Unsecured Debt      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 4,883,854 21,191,245  
Purchases of investments 83,511 11,705,915  
Payment-in-kind interest 530,361 417,435  
Sales and redemptions   (29,384,595)  
Change in unrealized (depreciation) appreciation included in earnings (687,778) 875,354  
Amortization of premium and accretion of discount, net (13,950) (78,500)  
Fair value at end of period 4,823,898 4,883,854 21,191,245
Equity Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 64,903,427 52,840,000  
Purchases of investments 9,101,485 22,105,811  
Sales and redemptions (18,873,195) (33,210,915)  
Realized gains (losses) 11,811,371 23,993,443  
Change in unrealized (depreciation) appreciation included in earnings (7,900,302) (824,912)  
Change in unrealized (depreciation) appreciation on foreign currency included in earnings 7,146    
Fair value at end of period $ 59,049,932 $ 64,903,427 $ 52,840,000