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Note 14 - Segment Information (Details Textual)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Oct. 01, 2016
USD ($)
Jul. 02, 2016
USD ($)
Apr. 02, 2016
USD ($)
Jan. 02, 2016
USD ($)
Sep. 26, 2015
USD ($)
Jun. 27, 2015
USD ($)
Mar. 28, 2015
USD ($)
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Dec. 27, 2014
USD ($)
Number of Operating Segments                 3    
Asset Impairment Charges   $ 14.8                  
Business Combination, Acquisition Related Costs $ 3.2 5.9 $ 6.1 $ 6.2 $ 4.0 $ 0.3 $ 0.2 $ 0.2      
Legal Fees 1.2 $ 0.9 0.1 0.4 0.1 0.9 1.7 1.2      
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | Outside the United States [Member]                      
Concentration Risk, Percentage                   66.00%  
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member] | CHINA                      
Concentration Risk, Percentage                   25.00%  
Facility Relocation [Member]                      
Restructuring Charges $ 0.1   0.7 1.0 $ 2.1 $ 1.2 $ 0.9 $ 1.0      
Facility Closing [Member]                      
Restructuring Charges     $ 0.3 $ 1.6              
Cost of Sales [Member]                      
Severance Costs                     $ 2.7
Cost of Sales [Member] | Sym Com Inc [Member]                      
Noncash Charges Related To Inventory Stepup                     2.8
Cost of Sales [Member] | Facility Relocation [Member]                      
Restructuring Charges                   $ 5.2  
Selling, General and Administrative Expenses [Member]                      
Business Combination, Acquisition Related Costs                   4.6  
Legal Fees                   3.6 2.2
Pension and Other Postretirement Benefit Expense                   31.9  
Severance Costs                     0.5
Selling, General and Administrative Expenses [Member] | Sym Com Inc [Member]                      
Business Combination, Acquisition Related Costs                     0.4
Other Segments [Member] | Cost of Sales [Member]                      
Asset Impairment Charges                 $ 14.8    
Other Segments [Member] | Cost of Sales [Member] | Facility Relocation [Member]                      
Restructuring Charges                   $ 1.6  
Other Segments [Member] | Selling, General and Administrative Expenses [Member]                      
Asset Impairment Charges                     0.1
Business Combination, Acquisition Related Costs                 29.2    
Legal Fees                 2.5    
Other Segments [Member] | Selling, General and Administrative Expenses [Member] | Facility Closing [Member]                      
Restructuring Charges                 $ 1.9    
Other Segments [Member] | Research and Development Expense [Member]                      
Asset Impairment Charges                     $ 0.2