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Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Income Taxes [Line Items]        
Income Tax Expense (Benefit) $ 346 $ 410 $ 1,452 $ 697