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Provision for Taxes (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2017
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]        
Income tax at statutory rate   $ 5,553 $ 5,431 $ 5,439
Increase (decrease) in income tax resulting from        
State tax expense, net of federal effect   660 (191) 194
Federal true-ups   (23) 193 8
Federal tax credits   (115) (242) (189)
Effect of foreign tax rates   (304) (399) (443)
Valuation allowances (state and foreign)   (150) (148) 19
Captive insurance earnings   (263) (128) 311
Incentive stock options   (9) (22) 20
Deferred state rate adjustments   0 0 (1,194)
Tax Cuts & Jobs Act of 2017 $ (3,000) 588 (2,986) 0
Other   63 (52) (116)
Recorded provision for income taxes   $ 6,000 $ 1,456 $ 4,049