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Note 13 - Segment and Geographic Information (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2016
USD ($)
Sep. 26, 2015
USD ($)
Oct. 01, 2016
USD ($)
Sep. 26, 2015
USD ($)
Custom Products Reporting Unit [Member]        
Asset Impairment Charges $ 14,800   $ 14,800  
PolySwitch [Member]        
Business Combination, Acquisition Related Costs 5,900   18,200  
Inventory Charge Related to Step-up in Cost Basis 600   7,500  
DENMARK        
Business Exit Costs     1,900  
Facility Relocation [Member]        
Restructuring Charges     1,700  
Internal Legal Restructuring Costs [Member]        
Restructuring Charges $ 900 $ 2,100 $ 1,300 $ 6,800
Number of Operating Segments     3  
Business Combination, Acquisition Related Costs   300   700
Inventory Charge Related to Step-up in Cost Basis     $ 7,456
Termination of U.S. Pension Plan, Expense   $ 30,900   $ 32,200