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Fair Value Measurements - Schedule of Level 3 Assets measured at Fair Value (Details) - USD ($)
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance $ 657,346,204 $ 536,309,597
Amortization of fixed income premiums or accretion of discounts 4,576,734 5,541,082
Purchases of investments 399,037,328 235,786,783
Sales or repayments of investments (145,479,437) (202,132,301)
Transfers out of Level 3 (2,238,726) (15,305,039)
Realized gain (loss) (850,754) (418,037)
Change in unrealized appreciation (depreciation) (16,527,076) (6,348,690)
Fair value, Ending balance 895,864,273 553,433,395
Change in unrealized appreciation (depreciation) on Level 3 investments (17,714,912) (19,597,914)
Preferred Stock    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 1,332,420 1,336,268
Purchases of investments   2,000,000
Sales or repayments of investments 800,000  
Change in unrealized appreciation (depreciation) (147,735) (2,258,653)
Fair value, Ending balance 384,685 1,077,615
Change in unrealized appreciation (depreciation) on Level 3 investments (77,340) (258,653)
Common Stock    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Purchases of investments 4,551,235  
Change in unrealized appreciation (depreciation) (3,323,038)  
Fair value, Ending balance 1,228,197  
Change in unrealized appreciation (depreciation) on Level 3 investments (3,323,038)  
Senior Secured Term Loans    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 623,053,646 501,964,657
Amortization of fixed income premiums or accretion of discounts 4,488,454 5,541,082
Purchases of investments 391,506,142 233,311,709
Sales or repayments of investments 143,170,836 202,045,467
Change in unrealized appreciation (depreciation) (13,349,417) (7,166,257)
Fair value, Ending balance 862,527,989 531,605,724
Change in unrealized appreciation (depreciation) on Level 3 investments (12,453,978) (7,090,189)
Second Lien Term Loans    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 12,872,588  
Amortization of fixed income premiums or accretion of discounts 88,280  
Purchases of investments 490,100  
Change in unrealized appreciation (depreciation) (47,723)  
Fair value, Ending balance 13,403,245  
Change in unrealized appreciation (depreciation) on Level 3 investments (47,723)  
Warrants    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value, Beginning balance 20,087,550 33,008,672
Purchases of investments 2,489,851 475,074
Sales or repayments of investments 1,508,601 86,834
Transfers out of Level 3 2,238,726 15,305,039
Realized gain (loss) (850,754) (418,037)
Change in unrealized appreciation (depreciation) 340,837 3,076,220
Fair value, Ending balance 18,320,157 20,750,056
Change in unrealized appreciation (depreciation) on Level 3 investments $ (1,812,833) $ (12,249,072)