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Note 3 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jun. 01, 2018
Mar. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 07, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total     $ 65,440 $ (1,257) $ 61,386  
Goodwill, Ending Balance     764,655 721,523 704,640  
Pramac [Member]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   35.00%        
International [Member]            
Goodwill, Ending Balance     $ 143,204 $ 100,072 $ 83,189  
Selmec [Member]            
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 79,972          
Business Combination, Liabilities Arising from Contingencies, Amount Recognized 14,902          
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill 80,418          
Selmec [Member] | International [Member]            
Goodwill, Ending Balance $ 46,788          
Pramac [Member]            
Payments to Acquire Businesses, Net of Cash Acquired, Total   $ 60,250        
Goodwill, Ending Balance   $ 46,775        
Business Acquisition, Percentage of Voting Interests Acquired   65.00%        
Redeemable Noncontrolling Interest, Equity, Fair Value, Total   $ 34,253        
Noncontrolling Interest, Term of Put Option   5 years        
Noncontrolling Interest, Term of Put Option in which Option Price is Fixed   2 years        
Pramac [Member] | Subsequent Event [Member]            
Business Acquisition, Portion of Remaining Interest, Callable           35.00%