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Note 2 - Acquisition of Business (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 03, 2014
Mar. 29, 2014
Jun. 27, 2015
Jun. 28, 2014
Sym Com Inc [Member] | Trademarks [Member] | Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life 15 years      
Sym Com Inc [Member] | Trademarks [Member] | Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life 20 years      
Sym Com Inc [Member] | Patents [Member] | Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life 16 years      
Sym Com Inc [Member] | Patents [Member] | Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life 17 years      
Sym Com Inc [Member]        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%      
Payments to Acquire Businesses, Net of Cash Acquired $ 52,800      
Business Acquisition Inventory Stepup $ 2,600      
Noncash Charges Related To Inventory Stepup   $ 1,400    
Payments to Acquire Businesses, Net of Cash Acquired       $ 52,768