Note 8 - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. Federal taxes at statutory rate	$ 50,897	$ 83,303	$ 57,509
State and local taxes, net of U.S. Federal tax	5,427	8,399	2,365
Other, net	63	(1,002)	(74)
Provision for Income Taxes	$ 56,387	$ 90,700	$ 59,800