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Income Taxes Income Tax Reconciliation, Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Tax Cuts and Jobs Act Narrative [Abstract]      
Federal statutory rate 21.00% 21.00% 21.00%
Deferred Tax Liabilities, Net $ 91 $ 91  
Income tax provision (benefit) 312 657 $ 831
Tax Reconciliation Details [Abstract]      
Change in valuation allowance 1,754 (3,400) 3,990
Income taxes paid, net of tax refunds $ (100) $ 128 $ 20