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Note 9 - Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Amortization of Intangible Assets $ 6,460 $ 4,235 $ 18,684 $ 12,365
Finite-Lived Intangible Assets, Amortization Expense, Year Two 20,400   20,400  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 15,200   15,200  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 12,200   12,200  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 8,100   8,100  
Finite-Lived Intangible Assets, Amortization Expense, Year Six $ 4,800   4,800  
Goodwill, Impairment Loss     0 0
Impairment of Intangible Assets (Excluding Goodwill)     $ 0 $ 0