Note 5 - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 8,987	$ 9,280	$ 10,402
State	1,125	946	2,015
	10,112	10,226	12,417
Deferred:
Federal	12,427	13,042	8,648
State	1,063	1,678	774
	13,490	14,720	9,422
Total provision	$ 23,602	$ 24,946	$ 21,839