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Note 15 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($)
$ in Thousands
Oct. 28, 2021
Oct. 15, 2021
Oct. 06, 2021
October 2021 Agreement [Member] | M&T Bank [Member]      
Debt Instrument, Term (Year)   5 years  
Debt Instrument, Interest Rate in Event of Default   2.00%  
October 2021 Agreement [Member] | M&T Bank [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 10,000  
October 2021 Agreement [Member] | M&T Bank [Member] | Term Note [Member]      
Debt Instrument, Face Amount   $ 25,000  
Debt Instrument, Draw Period (Year)   2 years  
Debt Instrument, Interest Rate, Stated Percentage   2.20%  
Proceeds from Issuance of Long-term Debt, Total $ 12,000    
Debt Instrument, Interest Rate, Effective Percentage 3.20%    
Z-Sciences [Member]      
Payments to Acquire Businesses, Gross     $ 500
Business Combination, Consideration Transferred, Amount Held in Escrow     $ 200
Videology [Member]      
Payments to Acquire Businesses, Gross $ 12,000    
Business Combination, Consideration Transferred, Amount Held in Escrow $ 1,200