Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Concentrations of Portfolio Company Values Compared to the Fair Value of the Corporation's Total Investment Portfolio (Details)

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Summary of Significant Accounting Policies - Concentrations of Portfolio Company Values Compared to the Fair Value of the Corporation's Total Investment Portfolio (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Tilson    
Accounting Policies [Line Items]    
Concentration risk investment portfolio 16.00% 17.00%
Seybert's    
Accounting Policies [Line Items]    
Concentration risk investment portfolio 9.00% 10.00%
Sciaps    
Accounting Policies [Line Items]    
Concentration risk investment portfolio 8.00% 8.00%
FSS    
Accounting Policies [Line Items]    
Concentration risk investment portfolio 8.00%  
INEA    
Accounting Policies [Line Items]    
Concentration risk investment portfolio 6.00%  
DSD    
Accounting Policies [Line Items]    
Concentration risk investment portfolio   8.00%
Caitec    
Accounting Policies [Line Items]    
Concentration risk investment portfolio   6.00%