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Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amortization of Intangible Assets $ 32,953 $ 23,591 $ 21,024
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 27,856    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 19,511    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 17,816    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 17,743    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 15,958