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Provision for Taxes (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Income Tax Contingency [Line Items]      
Income tax at statutory rate $ 5,431 $ 5,439 $ 5,486
Increase (decrease) in income tax resulting from      
State tax expense, net of federal effect (191) 194 318
Federal true-ups 193 8 (38)
Federal tax credits (242) (189) (802)
Effect of foreign tax rates (399) (443) (474)
Valuation allowances (state and foreign) (148) 19 0
Captive insurance earnings (128) 311 (361)
Incentive stock options (22) 20 57
Deferred state rate adjustments 0 (1,194) 0
Tax Cuts & Jobs Act of 2017 (2,986) 0 0
Other (52) (116) (118)
Recorded provision for income taxes $ 1,456 $ 4,049 $ 4,068