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PORTFOLIO INVESTMENTS AND FAIR VALUE - Aggregate Values of Level 3 Portfolio Investments Change (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 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 87,741,479   211,010,869
Payment-in-kind interest 1,904,853   1,357,177
Sales and redemptions (44,089,764)   (127,842,800)
Realized (losses) gains 56,198   3,772,512
Amortization of premium and accretion of discount, net (1,360,629) (1,174,220) (2,519,462)
Fair value at end of period 881,666,450   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 (10,544,875)   (17,542,230)
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 504,292   (1,414,678)
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 83,194,907   196,925,873
Payment-in-kind interest 1,591,000   826,816
Sales and redemptions (43,929,215)   (98,160,329)
Realized (losses) gains (870)   (3,929,334)
Amortization of premium and accretion of discount, net (1,277,950)   (2,303,833)
Fair value at end of period 779,447,364   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 1,255,813   (7,342,462)
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 502,271   (1,421,824)
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)
Amortization of premium and accretion of discount, net (74,926)   (201,679)
Fair value at end of period 33,918,725   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 (11,460,501)   (1,611,688)
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 313,853   530,361
Amortization of premium and accretion of discount, net (7,753)   (13,950)
Fair value at end of period 5,708,477   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 562,973   (687,778)
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 4,546,572   9,101,485
Sales and redemptions (160,549)   (18,873,195)
Realized (losses) gains 57,068   11,811,371
Fair value at end of period 62,591,884   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 (903,160)   (7,900,302)
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 $ 2,021   $ 7,146