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Investments - Schedule of Reconciliation of Investments Measured at Fair value on a recurring basis using Level 3 inputs (Details) - USD ($)
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Investment Owned, at Fair Value, Beginning Balance $ 233,683,986    
Purchases (including PIK interest) 53,237,881 $ 145,380,662 $ 92,065,783
Investment sales and repayments 61,928,745 153,877,788 108,183,417
Amortization 1,311,770 2,662,806 2,767,087
Net realized gains (losses) (26,890,095) (14,395,431) (5,776,334)
Net change in unrealized appreciation (depreciation) 20,696,532 8,058,117 (5,639,207)
Investment Owned, at Fair Value, Ending Balance $ 220,111,329 $ 233,683,986  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net Changes In Unrealized Appreciation Depreciation On Investments Net Changes In Unrealized Appreciation Depreciation On Investments  
Senior Secured First Lien Debt Investments      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Investment Owned, at Fair Value, Beginning Balance $ 214,858,036    
Investment Owned, at Fair Value, Ending Balance 196,370,955 $ 214,858,036  
Equity, Warrants and Other Investments      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Investment Owned, at Fair Value, Beginning Balance 18,825,950    
Investment Owned, at Fair Value, Ending Balance 23,740,374 18,825,950  
Fair Value, Inputs, Level 3      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Investment Owned, at Fair Value, Beginning Balance 233,683,986 245,855,620  
Purchases (including PIK interest) 53,237,881 145,380,662  
Investment sales and repayments (61,928,745) (153,877,788)  
Amortization 1,311,770 2,662,806  
Net realized gains (losses) (26,890,095) (14,395,431)  
Transfers in 1,708,942 1,184,506  
Transfers out (1,708,942) (1,184,506)  
Net change in unrealized appreciation (depreciation) 20,696,532 8,058,117  
Investment Owned, at Fair Value, Ending Balance 220,111,329 233,683,986 245,855,620
Change in unrealized appreciation (depreciation) relating to assets (6,129,454) (4,242,746)  
Fair Value, Inputs, Level 3 | Senior Secured First Lien Debt Investments      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Investment Owned, at Fair Value, Beginning Balance 214,858,036 230,351,618  
Purchases (including PIK interest) 51,824,515 136,101,744  
Investment sales and repayments (61,928,745) (145,707,097)  
Amortization 1,311,770 2,598,931  
Net realized gains (losses) (9,515,487) (11,580,771)  
Transfers out (1,708,942) (1,184,506)  
Net change in unrealized appreciation (depreciation) 1,529,808 4,278,117  
Investment Owned, at Fair Value, Ending Balance 196,370,955 214,858,036 230,351,618
Change in unrealized appreciation (depreciation) relating to assets (7,507,021) (6,326,622)  
Fair Value, Inputs, Level 3 | Senior Secured Second Lien Debt Investments      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Investment Owned, at Fair Value, Beginning Balance   6,240,000  
Investment sales and repayments   (8,000,000)  
Amortization   63,875  
Net realized gains (losses) (17,374,608)    
Net change in unrealized appreciation (depreciation) 17,374,608 1,696,125  
Investment Owned, at Fair Value, Ending Balance     6,240,000
Fair Value, Inputs, Level 3 | Equity, Warrants and Other Investments      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Investment Owned, at Fair Value, Beginning Balance 18,825,950 9,264,002  
Purchases (including PIK interest) 1,413,366 9,278,918  
Investment sales and repayments   (170,691)  
Net realized gains (losses)   (2,814,660)  
Transfers in 1,708,942 1,184,506  
Net change in unrealized appreciation (depreciation) 1,792,116 2,083,875  
Investment Owned, at Fair Value, Ending Balance 23,740,374 18,825,950 $ 9,264,002
Change in unrealized appreciation (depreciation) relating to assets $ 1,377,567 $ 2,083,876