Note 10 - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal income taxes
Current	$ 2,552	$ 230	$ 210
Deferred	1,661	2,380	5,528
Total federal tax expense	4,213	2,610	$ 5,738
State income taxes
Current	366	14
Deferred	365	561	$ 629
Total state tax expense	731	575	629
Total income tax expense	$ 4,944	$ 3,185	$ 6,367