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Note 2 - Pramac Acquisition (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 01, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Payments to Acquire Businesses, Net of Cash Acquired     $ (1,160) $ 60,886
Number of Countries Where Product is Sold by Subsidiary     150  
Business Acquisition, Pro Forma Revenue   $ 367,376   $ 683,258
Pramac [Member]        
Business Acquisition, Percentage of Voting Interests Acquired 65.00%      
Payments to Acquire Businesses, Net of Cash Acquired $ 60,250      
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