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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Oct. 02, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total           $ 12,317 $ 150,277  
Goodwill, Ending Balance       $ 317,676   317,676   $ 316,298
Business Acquisition, Pro Forma Revenue             1,302,956  
Revenue from Contract with Customer, Including Assessed Tax       442,395 $ 431,795 1,352,839 $ 1,115,842  
AB Electronics Sensing and Control Business [Member]                
Payments to Acquire Businesses, Net of Cash Acquired, Total     $ 162,038          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total     18,168          
Goodwill, Ending Balance     $ 27,320          
Revenue from Contract with Customer, Including Assessed Tax           266,970    
AB Electronics Sensing and Control Business [Member] | Customer Relationships [Member]                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     6 years          
AVX Antenna [Member]                
Payments to Acquire Businesses, Net of Cash Acquired, Total   $ 127,677            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total   64,800            
Goodwill, Ending Balance   $ 68,755            
Revenue from Contract with Customer, Including Assessed Tax       25,512   89,259    
Goodwill, Purchase Accounting Adjustments       (9,064)        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Noncurrent Assets (Liabilities), Net       (9,064)        
AVX Antenna [Member] | Customer Relationships [Member]                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   13 years            
Kumatec [Member]                
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 12,882              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total 3,189              
Goodwill, Ending Balance $ 9,802              
Revenue from Contract with Customer, Including Assessed Tax       $ 1,450   $ 4,204    
Kumatec [Member] | Trade Names [Member]                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years