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Income Taxes (Components of deferred income tax valuation allowance) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Income Tax Disclosure [Abstract]    
Balance, beginning of year $ 6,219 $ 5,445
Increase (decrease) in valuation allowance (1,935) 774
Balance, end of year $ 4,284 $ 6,219