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Provision for Taxes (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Income Tax Contingency [Line Items]      
Income tax at statutory rate $ 5,439 $ 5,486 $ 4,255
Increase (decrease) in income tax resulting from      
State tax expense, net of federal effect 194 318 291
Federal true-ups 8 (38) 55
Federal tax credits (189) (802) (568)
Effect of foreign tax rates (443) (474) (1,107)
Valuation allowances (state and foreign) 19 0 (1,406)
Captive insurance earnings 311 (361) (398)
Incentive stock options 20 57 155
Deferred state rate adjustments (1,194) 0 0
Foreign exchange gain on sale of Information Security 0 0 (898)
Other (116) (118) (40)
Recorded provision for income taxes $ 4,049 $ 4,068 $ 339