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CREDIT FACILITY (Credit Facility) (Details)
6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 20, 2019
USD ($)
Debt Instrument [Line Items]        
Debt outstanding $ 24,175,000 $ 24,175,000 $ 24,175,000  
Debt, weighted average interest rate 2.40% 2.40%    
Debt instrument, weighted average years to maturity   3 months    
Line of credit outstanding $ 24,175,000 $ 24,175,000 24,175,000  
Line of credit        
Debt Instrument [Line Items]        
Debt outstanding 24,175,000 24,175,000 24,175,000  
J. P. Morgan Chase Bank, N.A. | Line of credit        
Debt Instrument [Line Items]        
Line of credit outstanding $ 24,200,000 $ 24,200,000    
Debt Instrument, Extension Period 1 year      
J. P. Morgan Chase Bank, N.A. | Line of credit | Revolving credit facility        
Debt Instrument [Line Items]        
Debt, weighted average interest rate 2.40% 2.40%    
Line of credit facility, borrowing capacity (up to)     $ 100,000,000 $ 29,280,000
Interest rate 1.20% 1.20%    
Line of credit facility, remaining borrowing capacity $ 5,100,000 $ 5,100,000    
Line of credit facility, covenant, minimum consolidated net worth (greater than or equal) 75.00% 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% 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 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   2.20%    
J. P. Morgan Chase Bank, N.A. | Line of credit | Revolving credit facility | Federal Funds Effective Rate        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   0.50%    
J. P. Morgan Chase Bank, N.A. | Line of credit | Revolving credit facility | LIBOR        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   1.00%