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Note 2 - Pramac Acquisition (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 01, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Payments to Acquire Businesses, Net of Cash Acquired     $ (1,257) $ 61,386
Number of Countries Where Product is Sold by Subsidiary     150  
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      
Business Acquisition, Pro Forma Revenue   $ 373,121   $ 1,056,379