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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Income Tax Examination [Line Items]        
U.S statutory income tax expense rate   35.00% 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   1,900,000    
Foreign net operating loss carryforwards   3,700,000    
Valuation allowance   984,000 $ 1,042,000  
Undistributed earnings in foreign subsidiaries   4,900,000    
U.S. federal or state deferred income taxes   0    
Accrued income tax-related interest and penalties   256,000 228,000  
ASC 740-10 tax liabilities, current   766,000 $ 738,000 $ 712,000
FRANCE        
Income Tax Examination [Line Items]        
Foreign net operating loss carryforwards   500,000    
AUSTRALIA        
Income Tax Examination [Line Items]        
Foreign net operating loss carryforwards   $ 800,000    
Scenario, Plan [Member]        
Income Tax Examination [Line Items]        
U.S statutory income tax expense rate 21.00%