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Note 2 - Acquisitions (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 01, 2016
USD ($)
Aug. 01, 2015
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
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 $ 53,665        
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      
Payments to Acquire Businesses, Net of Cash Acquired       $ 60,886 $ (233)
Number of Countries Where Product is Sold by Subsidiary       150  
Goodwill     $ 669,719 $ 716,845