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Investments - Summary of Investment Portfolio (Detail)
Dec. 31, 2019
USD ($)
year
Investment
Nov. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Investment Holdings [Line Items]      
Number of debt investments on non accrual status | Investment 0    
Cost $ 133,274,339   $ 76,774,339
Fair Value $ 144,195,000   $ 82,500,000
Fair Value Percentage of Investment Portfolio 100.00%   100.00%
Fair Value Percentage of Net Assets 82.70%   80.20%
Total Senior Secured Notes      
Investment Holdings [Line Items]      
WeightedAverageYearsToMaturity | year 4.1    
Cost $ 48,167,603   $ 30,700,000
Fair Value $ 48,167,603   $ 30,700,000
Fair Value Percentage of Investment Portfolio 33.40%   37.20%
Fair Value Percentage of Net Assets 27.60%   29.80%
Senior secured debt - first lien      
Investment Holdings [Line Items]      
Cost $ 17,700,000   $ 15,700,000
Fair Value $ 17,700,000   $ 15,700,000
Fair Value Percentage of Investment Portfolio 12.30%   19.00%
Fair Value Percentage of Net Assets 10.10%   15.20%
Senior secured debt - second lien      
Investment Holdings [Line Items]      
Cost $ 30,467,603   $ 15,000,000
Fair Value $ 30,467,603   $ 15,000,000
Fair Value Percentage of Investment Portfolio 21.10%   18.20%
Fair Value Percentage of Net Assets 17.50%   14.60%
Equity      
Investment Holdings [Line Items]      
Cost $ 85,106,736   $ 46,074,339
Fair Value $ 96,027,397   $ 51,800,000
Fair Value Percentage of Investment Portfolio 66.60%   62.80%
Fair Value Percentage of Net Assets 55.10%   50.40%
Lawn Doctor      
Investment Holdings [Line Items]      
Equity Method Investment, Ownership Percentage 62.00%   63.00%
Lawn Doctor | Senior secured debt - second lien      
Investment Holdings [Line Items]      
Cost $ 15,000,000    
Lawn Doctor | Equity      
Investment Holdings [Line Items]      
Cost $ 30,500,000    
Polyform Products, Co.      
Investment Holdings [Line Items]      
Equity Method Investment, Ownership Percentage 87.00%   87.00%
Polyform Products, Co. | Senior secured debt - first lien      
Investment Holdings [Line Items]      
Cost $ 15,700,000    
Polyform Products, Co. | Equity      
Investment Holdings [Line Items]      
Cost $ 15,600,000    
Roundtables [Member]      
Investment Holdings [Line Items]      
Equity Method Investment, Ownership Percentage 81.00%    
Roundtables [Member] | Senior secured debt - first lien      
Investment Holdings [Line Items]      
Cost $ 2,000,000 $ 2,000,000  
Roundtables [Member] | Senior secured debt - second lien      
Investment Holdings [Line Items]      
Cost 12,100,000    
Roundtables [Member] | Equity      
Investment Holdings [Line Items]      
Cost $ 32,400,000