Note 10 - Income Taxes Reconciliation of Taxes from Statutory Rate to Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%
(Benefit) provision for income taxes computed at the statutory tax rate	$ 169,290	$ 153,240	$ 142,504
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	9,988	(6,674)	0
State tax expense (benefit)	(8,974)	(7,619)	(451)
Valuation allowance	10,663	11,931	(995,008)
Other, net	(5,534)	5,412	537
Income tax (benefit) provision	$ 175,433	$ 156,290	$ (852,418)