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Note 3 - Acquisitions (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 01, 2016
USD ($)
Aug. 01, 2015
USD ($)
Oct. 01, 2014
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Payments to Acquire Businesses, Net of Cash Acquired           $ 61,386 $ 73,782 $ 61,196
Number of Countries Where Product is Sold by Subsidiary           150    
Goodwill       $ 669,719   $ 704,640 $ 669,719 $ 635,565
Pramac [Member]                
Business Acquisition, Percentage of Voting Interests Acquired 65.00%              
Payments to Acquire Businesses, Net of Cash Acquired $ 60,886              
Number of Countries Where Product is Sold by Subsidiary 150              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 35.00%              
Redeemable Noncontrolling Interest, Equity, Fair Value $ 34,253              
Noncontrolling Interest, Term of Put Option 5 years              
Noncontrolling Interest, Term of Put Option in which Option Price is Fixed 2 years              
Goodwill $ 46,202              
CHP [Member]                
Payments to Acquire Businesses, Net of Cash Acquired   $ 74,570            
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill   81,726            
Goodwill   30,076            
Increase (Decrease) in Intangible Assets, Non-current       (6,552)        
Goodwill, Period Increase (Decrease)       $ 6,208        
Noncash or Part Noncash Acquisition, Debt Assumed   $ 12,000            
MAC Inc. [Member]                
Payments to Acquire Businesses, Net of Cash Acquired     $ 53,747          
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill     49,378          
Goodwill     $ 25,898          
Increase (Decrease) in Intangible Assets, Non-current         $ (4,229)      
Goodwill, Period Increase (Decrease)         $ 2,481