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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 27, 2019
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Income Tax Disclosure [Abstract] |  |  |
U.S. operating loss carryforwards | $ 900 |  |
Foreign net operating loss carryforwards | 7,000 |  |
Valuation allowance | 1,602 | $ 1,558 |
Undistributed earnings in foreign subsidiaries | 5,400 |  |
Accrued income tax-related interest and penalties | 179 | 167 |
ASC 740-10 tax liabilities, current | $ 437 | $ 425 | $ 413

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