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CREDIT FACILITY (Credit Facility and Subordinate Promissory Note) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 20, 2019
USD ($)
Sep. 19, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]        
Long-term debt $ 24,175,000     $ 24,175,000
Debt, weighted average interest rate 4.00%      
Weighted average remaining term 9 months      
Credit facility $ 24,175,000     24,175,000
Line of Credit        
Line of Credit Facility [Line Items]        
Long-term debt 24,175,000     $ 24,175,000
Line of Credit | JPMorgan Chase Bank, N.A.        
Line of Credit Facility [Line Items]        
Credit facility $ 24,200,000      
Line of Credit | Revolving Credit Facility | JPMorgan Chase Bank, N.A.        
Line of Credit Facility [Line Items]        
Debt, weighted average interest rate 4.00%      
Credit facility $ 24,200,000      
Line of credit facility, maximum borrowing capacity   $ 29,300,000 $ 100,000,000  
Line of credit facility, remaining available borrowing capacity $ 5,100,000      
Line of credit facility, covenant, minimum consolidated net worth (percentage) 75.00%      
Line of Credit | Revolving Credit Facility | JPMorgan Chase Bank, N.A. | Minimum        
Line of Credit Facility [Line Items]        
Interest rate spread (percentage) 1.20%      
Debt covenant fixed charge coverage ratio 1.50      
Line of Credit | Revolving Credit Facility | JPMorgan Chase Bank, N.A. | Maximum        
Line of Credit Facility [Line Items]        
Debt covenant leverage ratio 60.00%      
Line of Credit | Revolving Credit Facility | JPMorgan Chase Bank, N.A. | LIBOR | Minimum        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate 2.20%      
Line of Credit | Revolving Credit Facility | JPMorgan Chase Bank, N.A. | Federal Funds Effective Rate        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate 0.50%      
Line of Credit | Revolving Credit Facility | JPMorgan Chase Bank, N.A. | Statutory Reserve Rate        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate 1.00%