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Debt - EBGL Premier Note (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Sep. 30, 2020
Jan. 31, 2020
Jun. 30, 2017
Debt Instrument [Line Items]        
Short-term debt and current portion of long-term debt $ 4,036,000 $ 4,260,000    
Revolving Credit Facility | EBGL Premier Note        
Debt Instrument [Line Items]        
Short-term debt and current portion of long-term debt 2,925,000 0    
Revolving Credit Facility | Revolving Credit Facility - Gerber KBS        
Debt Instrument [Line Items]        
Short-term debt and current portion of long-term debt $ 1,111,000 46,000    
Revolving Credit Facility | Line of Credit | EBGL Premier Note        
Debt Instrument [Line Items]        
Maximum borrowing capacity     $ 1,000,000.0 $ 3,000,000.0
Interest rate     5.75%  
Minimum debt service coverage ratio 100.00%      
Debt covenant, audited financial statements delivery period 120 days      
Short-term debt and current portion of long-term debt   $ 800,000    
Revolving Credit Facility | Line of Credit | EBGL Premier Note | Prime Rate        
Debt Instrument [Line Items]        
Interest rate       1.50%