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Note 7 - Long-term Debt, Net (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 26, 2018
Sep. 30, 2019
Jul. 01, 2019
Dec. 31, 2018
Dec. 08, 2015
Long-term Debt, Total   $ 52,987   $ 55,472  
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   1,308      
Debt Related Commitment Fees and Debt Issuance Costs $ 193        
Long-term Debt, Total   50,612   55,472  
Debt Instrument, Unamortized Discount, Total   3,857      
QuarterlyExcessCashFlowAmount   1,308      
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%        
Term Loan [Member]          
Repayments of Debt $ 55,586        
Payment for Debt Extinguishment or Debt Prepayment Cost 2,818        
Unamortized Debt Issuance Expense 3,136        
Promissory Notes [Member]          
Debt Instrument, Face Amount         $ 10,000
Repayments of Debt $ 11,425        
Long-term Debt, Total   2,375    
Debt Instrument, Unamortized Discount, Total   $ 125      
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%