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Note 5 - Long-term Debt, Net (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 26, 2018
Jun. 30, 2020
Dec. 31, 2019
Jul. 01, 2019
Long-term Debt, Total   $ 47,792 $ 50,971  
Refinanced Term Loan [Member]        
Debt Instrument, Face Amount $ 70,000      
Debt Instrument, Interest Rate Floor 0.50%      
Debt Instrument, Quarterly Principal Amortization $ 875      
Payment for Debt Extinguishment or Debt Prepayment Cost   4,927    
Long-term Debt, Total   45,341 48,571  
Debt Instrument, Unamortized Discount, Total   3,072 3,715  
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   2,451 2,400  
Debt Instrument, Unamortized Discount, Total   $ 49 $ 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%