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CREDIT FACILITY (Credit Facility) (Details)
9 Months Ended
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 20, 2019
USD ($)
Debt Instrument [Line Items]      
Debt outstanding $ 25,597,242 $ 24,175,000  
Debt, weighted average interest rate 3.00%    
Debt instrument, weighted average years to maturity 1 year    
Line of credit outstanding $ 25,597,242 $ 24,175,000  
J. P. Morgan Chase Bank, N.A. | Line of credit      
Debt Instrument [Line Items]      
Line of credit outstanding $ 25,700,000    
J. P. Morgan Chase Bank, N.A. | Line of credit | Revolving credit facility      
Debt Instrument [Line Items]      
Debt, weighted average interest rate 3.00%    
Line of credit facility, borrowing capacity (up to)     $ 25,675,000
Interest rate 1.75%    
Line of credit facility, remaining borrowing capacity $ 0    
Line of credit facility, covenant, minimum consolidated net worth (greater than or equal) 75.00%    
J. P. Morgan Chase Bank, N.A. | Line of credit | Revolving credit facility | Maximum      
Debt Instrument [Line Items]      
Line of credit facility, covenant, leverage ratio (no greater than) 60.00%    
J. P. Morgan Chase Bank, N.A. | Line of credit | Revolving credit facility | Minimum      
Debt Instrument [Line Items]      
Debt instrument, covenant, fixed charge coverage ratio (equal to or greater than) 1.50    
J. P. Morgan Chase Bank, N.A. | Line of credit | Revolving credit facility | Statutory Reserve Rate      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate 2.75%