Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.8.0.1
Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2017
Dec. 31, 2018
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Dec. 27, 2014
Income Tax Disclosure [Line Items]            
Corporate tax rate     35.00%      
Additional income tax expense $ 459          
Provisional amount related to remeasurement of deferred tax assets and liabilities, benefit     $ 1,541      
Provisional amount related to one-time transition tax mandatory deemed repatriation of foreign earnings     2,000      
Cumulative foreign earnings 87,300   $ 87,300      
Provisional amount related to one-time transition tax mandatory deemed repatriation of foreign earnings payment period     8 years      
Cumulative earnings of foreign subsidiaries 87,300   $ 87,300      
Unrecognized tax benefit $ 4,542   $ 4,542 $ 3,501 $ 2,049 $ 1,156
Federal returns currently under examination     The Company’s federal returns are currently under examination by the Internal Revenue Service (IRS) in the United States for the periods 2007 through 2012      
Scenario, Forecast [Member]            
Income Tax Disclosure [Line Items]            
Corporate tax rate   21.00%        
Parent Company [Member]            
Income Tax Disclosure [Line Items]            
Third Party Export Sales     $ 85,479 $ 62,661 $ 58,207