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Income Taxes (Detail and Activity of The ASC 740-10 Liability) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Income Tax Disclosure [Abstract]    
Unrecognized Tax Benefits, Beginning Balance $ 402 $ 766
Additions based on tax positions 11 10
Reduction for prior year tax deductions   (374)
Unrecognized Tax Benefits, Ending balance $ 413 $ 402