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Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Income Tax Examination [Line Items]      
U.S statutory income tax expense rate 21.00% 21.00% 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 $ 1,100,000    
Foreign net operating loss carryforwards 8,900,000    
Valuation allowance 1,571,000 $ 1,191,000  
Undistributed earnings in foreign subsidiaries 3,800,000    
Transition tax 0    
Accrued income tax-related interest and penalties 155,000 144,000  
ASC 740-10 tax liabilities, current 413,000 $ 402,000 $ 766,000
UNITED KINGDOM      
Income Tax Examination [Line Items]      
Foreign net operating loss carryforwards 2,900,000    
FRANCE      
Income Tax Examination [Line Items]      
Foreign net operating loss carryforwards 900,000    
AUSTRALIA      
Income Tax Examination [Line Items]      
Foreign net operating loss carryforwards $ 1,700,000