Note 9 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortization of Intangible Assets, Total	$ 5,153	$ 6,657	$ 10,589	$ 12,224
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	10,000		10,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	15,400		15,400
Finite-Lived Intangible Assets, Amortization Expense, Year Three	12,400		12,400
Finite-Lived Intangible Assets, Amortization Expense, Year Four	8,300		8,300
Finite-Lived Intangible Assets, Amortization Expense, Year Five	4,800		4,800
Finite-Lived Intangible Assets, Amortization Expense, Year Six	$ 2,900		2,900
Goodwill, Impairment Loss			0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			$ 0