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Note 4 - Acquisition of Businesses (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 04, 2016
Mar. 25, 2016
Oct. 01, 2015
Jul. 02, 2016
Jun. 27, 2015
Jul. 02, 2016
Jun. 27, 2015
Menber's S.p.A. [Member] | Customer Relationships [Member]              
Finite-Lived Intangible Asset, Useful Life 10 years            
Menber's S.p.A. [Member] | Patented and Unpatented Technologies [Member]              
Finite-Lived Intangible Asset, Useful Life 5 years            
Menber's S.p.A. [Member] | Trademarks and Trade Names [Member]              
Finite-Lived Intangible Asset, Useful Life 10 years            
Menber's S.p.A. [Member] | Selling, General and Administrative Expenses [Member]              
Business Combination, Acquisition Related Costs       $ 100   $ 200  
Menber's S.p.A. [Member]              
Business Combination, Consideration Transferred $ 18,717            
Payments to Acquire Businesses, Gross $ 17,798            
Revenue, Net       6,800      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest       600      
PolySwitch [Member] | Customer Relationships [Member]              
Finite-Lived Intangible Asset, Useful Life   15 years          
PolySwitch [Member] | Patented and Unpatented Technologies [Member]              
Finite-Lived Intangible Asset, Useful Life   10 years          
PolySwitch [Member] | Selling, General and Administrative Expenses [Member]              
Business Combination, Acquisition Related Costs       5,700   11,600  
PolySwitch [Member] | Cost of Sales [Member]              
Business Combination, Acquisition Related Costs       900      
PolySwitch [Member]              
Business Combination, Consideration Transferred   $ 350,000          
Revenue, Net       36,400      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest       9,100      
Business Acquisition, Percentage of Voting Interests Acquired   100.00%          
Business Acquisition Inventory Stepup   $ 6,900          
Sigmar [Member] | Patents [Member]              
Finite-Lived Intangible Asset, Useful Life     10 years        
Sigmar [Member]              
Business Combination, Consideration Transferred     $ 6,689        
Payments to Acquire Businesses, Gross     $ 5,845        
Business Acquisition, Percentage of Voting Interests Acquired     100.00%        
Payments to Acquire Businesses, Net of Cash Acquired     $ 6,700        
Payments for Previous Acquisition           1,100  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 800        
Revenue, Net [1]       271,912 $ 222,021 491,310 $ 432,334
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest       $ 34,014 37,717 61,091 64,123
Business Combination, Acquisition Related Costs         $ 200   300
Payments to Acquire Businesses, Net of Cash Acquired           $ (331) $ (329)
[1] Sales by country represent sale to customer or distributor locations.