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STOCKHOLDER DIVIDENDS AND INCOME TAXES, Income Taxes (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Components of Dividends Paid to Stockholders [Abstract]        
Capital gain   $ 2,415,285    
Ordinary income   3,085,298    
Return of capital   24,521    
Total dividends $ 665,317 5,525,104 $ 5,542,591 $ 7,237,635
Components of Undistributed Earnings on Tax Basis [Abstract]        
Unrealized fair value appreciation   $ 4,813,649    
Aggregate Gross Unrealized Appreciation, Depreciation, and Cost Basis of Investments [Abstract]        
Aggregate gross unrealized appreciation     4,054,329  
Aggregate gross unrealized depreciation     (12,067,004)  
Net unrealized appreciation (depreciation)     (8,012,675)  
Aggregate cost (tax basis)     $ 101,717,821