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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
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