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Provision for Taxes (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Income Tax Contingency [Line Items]      
Income tax at statutory rate $ 5,486 $ 4,255 $ 5,840
Increase (decrease) in income tax resulting from      
State tax expense, net of federal effect 318 291 764
Federal true-ups (38) 55 (18)
Federal tax credits (802) (568) (256)
Effect of foreign tax rates (474) (1,107) (362)
Valuation allowances (state and foreign) 0 (1,406) 1,400
Captive insurance earnings (361) (398) (390)
Incentive stock options 57 155 130
Foreign exchange gain on sale of Information Security 0 (898) 0
Other (118) (40) (225)
Recorded provision for income taxes $ 4,068 $ 339 $ 6,883