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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Apr. 26, 2019
Mar. 12, 2019
Jun. 01, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total         $ 112,941 $ 71,926  
Goodwill, Ending Balance       $ 817,392 817,392   $ 764,655
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual       $ 12,342 $ 27,205    
Pika [Member]              
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 49,068            
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill 55,986            
Goodwill, Ending Balance $ 23,204            
Neurio [Member]              
Payments to Acquire Businesses, Net of Cash Acquired, Total   $ 59,071          
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill   58,763          
Goodwill, Ending Balance   24,263          
Business Combination, Liabilities Arising from Contingencies, Amount Recognized   $ 8,047          
Selmec [Member]              
Payments to Acquire Businesses, Net of Cash Acquired, Total     $ 79,972        
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill     79,826        
Goodwill, Ending Balance     46,196        
Business Combination, Liabilities Arising from Contingencies, Amount Recognized     $ 14,902