Note 12 - Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal	$ 24,012	$ 29,322	$ 30,235
State	661	3,568	3,095
	24,673	32,890	33,330
Federal	4,208	(532)	(1,172)
State	788	(227)	(334)
	4,996	(759)	(1,506)
Effective income tax expense	$ 29,669	$ 32,131	$ 31,824