Note 10 - Income Taxes Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current (benefit) provision	$ (42,398)	$ 59,122	$ 4,546
Deferred income tax (benefit) expense	120,573	166,527	170,887
Income tax (benefit) provision	$ 78,175	$ 225,649	$ 175,433