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Debt - EBGL Premier Note (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Jan. 31, 2020
Dec. 31, 2019
Sep. 30, 2017
Debt Instrument [Line Items]          
Short-term debt and current portion of long-term debt   $ 4,459,000   $ 4,036,000  
Revolving Credit Facility | EBGL Premier Note          
Debt Instrument [Line Items]          
Short-term debt and current portion of long-term debt   0   2,925,000  
Revolving Credit Facility | Revolving Credit Facility - Gerber KBS          
Debt Instrument [Line Items]          
Short-term debt and current portion of long-term debt   1,180,000   $ 1,111,000  
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   $ 900,000      
Revolving Credit Facility | Line of Credit | EBGL Premier Note | Prime Rate          
Debt Instrument [Line Items]          
Interest rate         1.50%