Note 9 - Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal	$ 3,120	$ 3,131	$ 2,638
State	651	580	336
Current income taxes	3,771	3,711	2,974
Deferred
Federal	546	508	1,262
State	30	(71)	(30)
Deferred income taxes	576	437	1,232
Total income tax provision	$ 4,347	$ 4,148	$ 4,206