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Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Oct. 06, 2018
Dec. 30, 2017
Oct. 07, 2017
Financial assets, Carrying Amount      
Cash and cash equivalents, Carrying Amount $ 11,121 $ 1,572 $ 1,646
Financial liabilities, Carrying Amount      
Current portion of Long-term debt, Carrying Amount   1,250 1,300
Long-term debt, Carrying Amount 0 21,871 24,738
Fair Value, Inputs, Level 1 [Member]      
Financial assets, Fair Value      
Cash and cash equivalents, Fair Value 11,121 1,572 1,646
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 24,738
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