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Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 23, 2019
Dec. 29, 2018
Mar. 24, 2018
Financial liabilities, Carrying Amount      
Long-term debt, Carrying Amount $ 3,662 $ 0 $ 3,750
Financial assets, Fair Value      
Cash and cash equivalents, Fair Value 4,299 2,824 2,863
Financial liabilities, Fair Value      
Current portion of Long-term debt, Fair Value     18,941
Long-term debt, Fair Value 3,662   3,750
Fair Value, Inputs, Level 1 [Member]      
Financial assets, Carrying Amount      
Cash and cash equivalents, Carrying Amount 4,299 2,824 2,863
Financial liabilities, Carrying Amount      
Current portion of Long-term debt, Carrying Amount     0
Long-term debt, Carrying Amount 0   0
Fair Value, Inputs, Level 2 [Member]      
Financial assets, Carrying Amount      
Cash and cash equivalents, Carrying Amount 0 0 0
Financial liabilities, Carrying Amount      
Current portion of Long-term debt, Carrying Amount     18,941
Long-term debt, Carrying Amount 3,662   3,750
Fair Value, Inputs, Level 3 [Member]      
Financial assets, Carrying Amount      
Cash and cash equivalents, Carrying Amount 0 $ 0 0
Financial liabilities, Carrying Amount      
Current portion of Long-term debt, Carrying Amount     0
Long-term debt, Carrying Amount $ 0   $ 0