Note 7 - Segment Information - Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Net interest income	$ 10,268	$ 8,985	$ 31,204	$ 26,291
Provision expense	1,601	1,708	1,921	2,328
Noninterest income	2,282	1,693	7,507	6,789
Noninterest expense	9,222	8,828	28,473	24,570
Tax expense	74	(216)	1,706	1,286
Net income	1,653	358	6,611	4,896
Assets	1,019,614	970,230	1,019,614	970,230	$ 954,640
Banking [Member]
Net interest income	9,681	8,396	28,558	23,684
Provision expense	1,615	1,675	1,815	2,180
Noninterest income	2,224	1,655	6,965	6,220
Noninterest expense	8,579	8,167	26,477	22,460
Tax expense	69	(193)	1,338	975
Net income	1,642	402	5,893	4,289
Assets	1,008,078	957,889	1,008,078	957,889
Consumer Finance [Member]
Net interest income	587	589	2,646	2,607
Provision expense	(14)	33	106	148
Noninterest income	58	38	542	569
Noninterest expense	643	661	1,996	2,110
Tax expense	5	(23)	368	311
Net income	11	(44)	718	607
Assets	$ 11,536	$ 12,341	$ 11,536	$ 12,341