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PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate Values of Level 3 Portfolio Investments Change (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period $ 844,733,638 $ 772,873,326 $ 772,873,326
Purchases of investments 41,237,273   211,010,869
Payment-in-kind interest 769,954   1,357,177
Sales and redemptions (5,918,128)   (127,842,800)
Realized (losses) gains $ 3,507   $ 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     $ (17,542,230)
Amortization of premium and accretion of discount, net $ (665,998) (546,806) (2,519,462)
Fair value at end of period 877,493,781   844,733,638
Level 3 transfers 0   0
Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings (4,249,642)    
Change in unrealized (depreciation) appreciation on foreign currency included in earnings     (1,414,678)
Foreign Currency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings 251,181    
Senior SecuredLoans-First Lien      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 735,555,508 646,352,935 646,352,935
Purchases of investments 38,908,052   196,925,873
Payment-in-kind interest 598,421   826,816
Sales and redemptions (5,903,154)   (98,160,329)
Realized (losses) gains (870)   (3,929,334)
Change in unrealized (depreciation) appreciation included in earnings     (7,342,462)
Amortization of premium and accretion of discount, net (625,231)   (2,303,833)
Fair value at end of period 767,818,131   735,555,508
Senior SecuredLoans-First Lien | Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings (2,214,114)    
Change in unrealized (depreciation) appreciation on foreign currency included in earnings     (1,421,824)
Senior SecuredLoans-First Lien | Foreign Currency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings 249,057    
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 56,733,110
Purchases of investments     4,900,000
Sales and redemptions     (10,809,276)
Realized (losses) gains     (4,109,525)
Change in unrealized (depreciation) appreciation included in earnings     (1,611,688)
Amortization of premium and accretion of discount, net (36,959)   (201,679)
Fair value at end of period 43,780,075   45,304,300
Senior Secured Loans-Second Lien | Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings (1,561,184)    
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 4,883,854
Purchases of investments     83,511
Payment-in-kind interest 171,533   530,361
Change in unrealized (depreciation) appreciation included in earnings     (687,778)
Amortization of premium and accretion of discount, net (3,808)   (13,950)
Fair value at end of period 5,428,810   4,823,898
Unsecured Debt | Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings 429,571    
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 64,903,427
Purchases of investments 2,329,221   9,101,485
Sales and redemptions (14,974)   (18,873,195)
Realized (losses) gains 4,377   11,811,371
Change in unrealized (depreciation) appreciation included in earnings     (7,900,302)
Fair value at end of period 60,466,765   59,049,932
Equity Securities | Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings (903,915)    
Change in unrealized (depreciation) appreciation on foreign currency included in earnings     $ 7,146
Equity Securities | Foreign Currency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings $ 2,124