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Subsequent events (Details) - USD ($)
12 Months Ended
Mar. 13, 2020
Feb. 28, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Note Receivable [Abstract]          
Issuance of note receivable     $ 1,000,000 $ 0 $ 0
Outstanding principal balance of note receivable     $ 1,017,000 $ 0  
Subsequent Event [Member]          
Lease [Abstract]          
Extension period for leases   4 years      
Note Receivable [Abstract]          
Issuance of note receivable $ 600,000        
Outstanding principal balance of note receivable 1,600,000        
Subsequent Event [Member] | Revolving Credit Facility [Member] | Siena Lending Group LLC [Member]          
Credit Facility [Abstract]          
Maximum borrowing capacity $ 10,000,000        
Interest rate 6.50%        
Closing fee payable $ 63,000        
Percentage of closing fee payable on closing date 50.00%        
Percentage of closing fee payable on first anniversary of closing date 50.00%        
Percentage fee on unused borrowings 0.50%        
Percentage of eligible accounts receivable 85.00%        
Eligible inventory $ 5,000,000        
Percentage of eligible raw material and finished good inventory 50.00%        
Subsequent Event [Member] | Revolving Credit Facility [Member] | Siena Lending Group LLC [Member] | Prime Rate [Member]          
Credit Facility [Abstract]          
Basis spread on variable rate 1.75%        
Subsequent Event [Member] | Revolving Credit Facility [Member] | Siena Lending Group LLC [Member] | Federal Funds Rate [Member]          
Credit Facility [Abstract]          
Basis spread on variable rate 2.25%