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PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate values of Level 3 portfolio investments change (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period $ 772,873,326 $ 653,424,495 $ 653,424,495
Purchases of investments 180,956,810   389,414,531
Payment-in-kind interest 1,010,061   939,030
Sales and redemptions (74,553,639)   (290,076,916)
Realized gains (losses) 4,800,961   23,687,355
Amortization of premium and accretion of discount, net (1,839,720) (1,747,423) (2,412,991)
Fair value at end of period 871,733,280   772,873,326
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 (12,810,173)   (6,928,160)
Foreign Currency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings (2,383,786)    
Senior SecuredLoans-First Lien      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 646,352,935 508,673,064 508,673,064
Purchases of investments 168,278,616   354,637,555
Payment-in-kind interest 618,968   521,595
Sales and redemptions (62,655,976)   (214,319,978)
Realized gains (losses) (3,930,891)   1,475,577
Amortization of premium and accretion of discount, net (1,684,265)   (2,186,334)
Fair value at end of period 742,272,654   646,352,935
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 (5,691,477)   (6,821,212)
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 (2,383,786)    
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 70,720,186
Purchases of investments 4,900,000   965,250
Sales and redemptions     (13,161,428)
Realized gains (losses)     (1,781,665)
Amortization of premium and accretion of discount, net (145,180)   (148,157)
Fair value at end of period 58,220,675   56,733,110
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 (3,557,615)   (157,390)
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 21,191,245
Purchases of investments 83,511   11,705,915
Payment-in-kind interest 391,093   417,435
Sales and redemptions     (29,384,595)
Amortization of premium and accretion of discount, net (10,275)   (78,500)
Fair value at end of period 4,760,750   4,883,854
Unsecured Debt | Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings (607,983)   875,354
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 52,840,000
Purchases of investments 7,694,683   22,105,811
Sales and redemptions (11,897,663)   (33,210,915)
Realized gains (losses) 8,731,852   23,993,443
Fair value at end of period 66,479,201   64,903,427
Equity Securities | Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings $ (2,953,098)   $ (824,912)