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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016
Income Tax Examination [Line Items] |  |  |
U.S statutory income tax expense rate | 21.00% | 35.00% | 35.00%
Tax cuts and jobs act of 2017, provisional income tax benefit |  | $ 4,000,000 |
Deferred tax and transition tax calculations |  | 0 |
U.S. operating loss carryforwards | $ 1,600,000 |  |
Foreign net operating loss carryforwards | 6,300,000 |  |
Valuation allowance | 1,191,000 | 984,000 |
Undistributed earnings in foreign subsidiaries | 5,300,000 |  |
Transition tax | 0 |  |
Accrued income tax-related interest and penalties | 144,000 | 256,000 |
ASC 740-10 tax liabilities, current | 402,000 | $ 766,000 | $ 738,000
UNITED KINGDOM |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign net operating loss carryforwards | 1,900,000 |  |
FRANCE |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign net operating loss carryforwards | 900,000 |  |
AUSTRALIA |  |  |
Income Tax Examination [Line Items] |  |  |
Foreign net operating loss carryforwards | $ 700,000 |  |

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- Definition Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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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 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28680-109314 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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