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Note 12 - Segment and Geographic Information (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2016
USD ($)
Jun. 27, 2015
USD ($)
Jul. 02, 2016
USD ($)
Jun. 27, 2015
USD ($)
PolySwitch [Member]        
Business Combination, Acquisition Related Costs, Legal and Integration Costs $ 6,100   $ 12,300  
Inventory Charge Related to Step-up in Cost Basis 6,900   6,900  
DENMARK        
Business Exit Costs 300   $ 1,900  
Number of Operating Segments     3  
Inventory Charge Related to Step-up in Cost Basis     $ 6,902
Charges for Transfer of Manufacturing Operations 700 $ 900 1,700 1,900
Restructuring Charges $ 100 1,700 $ 400 2,900
Business Combination, Acquisition Related Costs   200   300
Termination of U.S. Pension Plan, Expense   $ 700   $ 1,300