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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
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Jan. 01, 2021 | Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Income Tax Disclosure [Abstract] |  |  |  |
U.S statutory income tax expense rate | 21.00% | 21.00% | 21.00% | 35.00%
Tax cuts and jobs act of 2017, provisional income tax benefit |  |  |  | $ 4,000,000.0
Deferred tax and transition tax calculations |  |  |  | $ 0
U.S. operating loss carryforwards | $ 900,000 |  |  |
Foreign net operating loss carryforwards | 11,600,000 |  |  |
Valuation allowance | 1,558,000 | $ 1,571,000 |  |
Undistributed earnings in foreign subsidiaries | 3,900,000 |  |  |
Transition tax | 0 |  |  |
Accrued income tax-related interest and penalties | 167,000 | 155,000 |  |
ASC 740-10 tax liabilities, current | $ 425,000 | $ 413,000 | $ 402,000 |

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- Definition Amount, before allocation of valuation allowances, of deferred tax asset attributable to deductible differences from reserves and accruals, compensation and benefit costs, and other provisions, reserves, and allowances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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- Definition Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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