Note 18 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal									$ 0	$ 0	$ 43,935
State									172	381	43
Foreign									16,969	14,992	11,186
Total current income tax expense									17,141	15,373	55,164
Deferred:
Federal									(12,179)	(6,886)	(55,718)
State									4,671	(2,595)	(3,284)
Foreign									35,980	28,841	25,502
Total deferred tax provision (benefit)									28,472	19,360	(33,500)
Total Income tax provision	$ 25,477	$ 9,626	$ (3,529)	$ 14,039	$ 31,386	$ 1,184	$ 29,105	$ (26,942)	$ 45,613	$ 34,733	$ 21,664