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Note 5 - Long-term Debt, Net (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Jul. 01, 2020
Mar. 26, 2018
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jul. 01, 2019
Long-term Debt, Total     $ 41,138   $ 50,971  
Repayments of Long-term Debt, Total     10,925 $ 5,851    
Refinanced Term Loan [Member]            
Debt Instrument, Face Amount   $ 70,000        
Debt Instrument, Interest Rate Floor   0.50%        
Debt Instrument, Quarterly Principal Amortization   $ 875        
Long-term Debt, Total     39,924   48,571  
Refinanced Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate   7.00%        
Refinanced Term Loan [Member] | Base Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate   6.00%        
Promissory Notes [Member]            
Long-term Debt, Total     1,214   2,400  
Debt Instrument, Unamortized Discount, Total     $ 36   $ 100  
Promissory Notes [Member] | Asset Purchase Agreement [Member]            
Long-term Debt, Total           $ 2,350
Debt Instrument, Unamortized Discount, Total           $ 150
Debt Instrument, Interest Rate, Effective Percentage           4.28%
Repayments of Long-term Debt, Total $ 1,250