Income Taxes Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	35.00%
Statutory rate applied to income (loss) from continuing operations before taxes	$ 3,142	$ (4,685)	$ (635)
Plus state income taxes, net of federal tax effect	12	(173)	(198)
Total statutory provision (benefit)	3,154	(4,858)	(833)
Nondeductible meals and entertainment	77	90	161
Executive compensation limitation	0	258	0
Federal tax credits	(545)	(286)	(200)
Reserve for uncertain tax positions	39	27	8
Change in valuation allowance	(3,400)	3,990	6,470
Tax reform	0	0	1,749
Stock-based compensation	86	82	146
Other items	(68)	(134)	8
Income tax provision (benefit)	$ (657)	$ (831)	$ 7,509

Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal and State Statutory Income Tax Rates

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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