Note 18 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal									$ 43,935		$ 51
State									43	(276)	252
Foreign									11,186	13,554	18,808
Total current income tax expense									55,164	13,278	19,111
Federal									(55,718)	57	168
State									(3,284)
Foreign									25,502	23,724	(35,336)
Total deferred tax provision (benefit)									(33,500)	23,781	(35,168)
Total provision (benefit) for income taxes	$ (28,329)	$ 6,224	$ 32,765	$ 11,004	$ 7,356	$ 12,109	$ 8,515	$ 9,079	$ 21,664	$ 37,059	$ (16,057)