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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, 2024
Mar. 31, 2023
Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period $ 874,460,683 $ 844,733,638 $ 844,733,638
Purchases of investments 28,516,430   187,469,608
Payment-in-kind interest 750,054   3,799,843
Sales and redemptions (31,483,866)   (137,816,595)
Realized losses $ (20,475,000)   $ (29,882,026)
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)
Amortization of premium and accretion of discount, net $ 702,543 665,998 $ 2,749,543
Fair value at end of period 875,884,146   874,460,683
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 23,518,590   2,792,152
Foreign Currency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation on foreign currency included in earnings (105,288)   614,520
Senior SecuredLoans-First Lien      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 774,789,320 735,555,508 735,555,508
Purchases of investments 27,776,073   174,156,432
Payment-in-kind interest 595,228   3,185,845
Sales and redemptions (21,648,975)   (125,442,776)
Realized losses     (11,200,184)
Amortization of premium and accretion of discount, net 666,525   2,591,838
Fair value at end of period 782,845,785   774,789,320
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 769,881   (4,667,866)
Senior SecuredLoans-First Lien | Foreign Currency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation on foreign currency included in earnings (102,267)   610,523
Senior Secured Loans-Second Lien      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 21,957,500 45,304,300 45,304,300
Sales and redemptions (9,782,348)   (9,882,105)
Realized losses (20,475,000)   (17,979,749)
Amortization of premium and accretion of discount, net 31,828   141,943
Fair value at end of period 11,948,850   21,957,500
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 20,216,870   4,373,111
Unsecured Debt      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 5,956,280 4,823,898 4,823,898
Purchases of investments 13,290   62,086
Payment-in-kind interest 154,826   613,998
Sales and redemptions     (211,627)
Amortization of premium and accretion of discount, net 4,190   15,762
Fair value at end of period 6,210,612   5,956,280
Unsecured Debt | Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings 82,238   651,997
Unsecured Debt | Foreign Currency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation on foreign currency included in earnings (212)   166
Equity Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value at beginning of period 71,757,583 $ 59,049,932 59,049,932
Purchases of investments 727,067   13,251,090
Sales and redemptions (52,543)   (2,280,087)
Realized losses     (702,093)
Fair value at end of period 74,878,899   71,757,583
Equity Securities | Operating Income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation included in earnings 2,449,601   2,434,910
Equity Securities | Foreign Currency      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized (depreciation) appreciation on foreign currency included in earnings $ (2,809)   $ 3,831