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Significant Accounting Policies (Details) - USD ($)
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Significant Accounting Policies (Details) [Line Items]      
Cash and cash equivalents $ 6,000,000 $ 22,800,000  
PIK Interest 1,500,000 800,000 $ 900,000
Non-accrual investments at fair value $ 6,500,000 $ 5,200,000  
Portfolio percentage at fair value 2.90% 2.70%  
Percentage of investment company taxable income 90.00%    
Federal excise tax percentage 4.00%    
Distributable ordinary income percentage 98.00%    
Capital gain net income percentage 98.20%    
Deferred tax asset, net $ 23,100,000 $ 26,200,000  
Valuation allowance 23,100,000 26,200,000  
Investments 264,100,000 262,600,000 206,900,000
Long-term capital loss 509,966,576    
Short-term capital loss $ 2,842,952    
Controlled Investment [Member]      
Significant Accounting Policies (Details) [Line Items]      
Outstanding voting securities percentage 25.00%    
Affiliated Investments [Member] | Minimum [Member]      
Significant Accounting Policies (Details) [Line Items]      
Outstanding voting securities percentage 5.00%    
Affiliated Investments [Member] | Maximum [Member]      
Significant Accounting Policies (Details) [Line Items]      
Outstanding voting securities percentage 25.00%    
PIK [Member]      
Significant Accounting Policies (Details) [Line Items]      
PIK Interest $ 300,000 $ 400,000 $ 2,600,000