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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Feb. 28, 2017
Aug. 29, 2016
Apr. 04, 2016
Mar. 25, 2016
Dec. 31, 2016
Dec. 31, 2015
Electronics [Member]            
Goodwill, Acquired During Period       $ 103,800    
Automotive [Member]            
Goodwill, Acquired During Period       $ 61,300    
Monolith [Member]            
Business Acquisition, Percentage of Voting Interests Acquired 62.00%          
Business Combination, Consideration Transferred $ 15,000          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low 1,000          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 10,000          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value 3,500          
ON Portfolio [Member]            
Business Combination, Consideration Transferred   $ 104,000        
Business Acquisition, Goodwill, Expected Tax Deductible Amount   7,300        
Business Acquisition Inventory Stepup   $ 700        
ON Portfolio [Member] | Customer Relationships [Member]            
Finite-Lived Intangible Asset, Useful Life   13 years 182 days        
ON Portfolio [Member] | Patented and Unpatented Technologies [Member] | Minimum [Member]            
Finite-Lived Intangible Asset, Useful Life   6 years        
ON Portfolio [Member] | Patented and Unpatented Technologies [Member] | Maximum [Member]            
Finite-Lived Intangible Asset, Useful Life   8 years 182 days        
ON Portfolio [Member] | Noncompete Agreements [Member]            
Finite-Lived Intangible Asset, Useful Life   4 years        
Menber's S.p.A. [Member]            
Business Combination, Consideration Transferred     $ 19,200      
Business Acquisition Inventory Stepup     $ 200      
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      
PolySwitch [Member]            
Business Acquisition, Percentage of Voting Interests Acquired       100.00%    
Business Combination, Consideration Transferred $ 348,292     $ 348,300    
Business Acquisition, Goodwill, Expected Tax Deductible Amount       64,900    
Business Acquisition Inventory Stepup       $ 6,900    
Payments to Acquire Businesses, Gross         $ 344,500  
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    
Monolith [Member]            
Cost Method Investments         $ 3,500 $ 3,500
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners           12.00%