Note 5 - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 9,280	$ 10,402	$ 15,964
State	946	2,015	1,889
	10,226	12,417	17,853
Deferred:
Federal	13,042	8,648	3,909
State	1,678	774	394
	14,720	9,422	4,303
Total provision	$ 24,946	$ 21,839	$ 22,156