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Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jul. 14, 2018
Dec. 30, 2017
Jul. 15, 2017
Dec. 31, 2016
Financial assets, Carrying Amount        
Cash and cash equivalents, Carrying Amount $ 15,572 $ 1,572 $ 2,280 $ 1,013
Financial liabilities, Carrying Amount        
Current portion of Long-term debt, Carrying Amount   1,250 1,300  
Long-term debt, Carrying Amount 0 21,871 22,386  
Fair Value, Inputs, Level 1 [Member]        
Financial assets, Fair Value        
Cash and cash equivalents, Fair Value 15,572 1,572 2,280  
Financial liabilities, Fair Value        
Current portion of Long-term debt, Fair Value   0 0  
Long-term debt, Fair Value   0 0  
Fair Value, Inputs, Level 2 [Member]        
Financial assets, Fair Value        
Cash and cash equivalents, Fair Value 0 0 0  
Financial liabilities, Fair Value        
Current portion of Long-term debt, Fair Value   1,250 1,300  
Long-term debt, Fair Value   21,871 22,386  
Fair Value, Inputs, Level 3 [Member]        
Financial assets, Fair Value        
Cash and cash equivalents, Fair Value $ 0 0 0  
Financial liabilities, Fair Value        
Current portion of Long-term debt, Fair Value   0 0  
Long-term debt, Fair Value   $ 0 $ 0