Note 7 - Segment Information - Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Net interest income	$ 10,640	$ 10,071	$ 22,150	$ 20,936
Provision expense	(23)	175	733	320
Noninterest income	2,538	2,112	5,614	5,225
Noninterest expense	9,674	9,876	19,482	19,251
Tax expense	551	391	1,207	1,632
Net income	2,976	1,741	6,342	4,958
Assets	1,025,364	980,156	1,025,364	980,156	$ 1,026,290
Banking [Member]
Net interest income	10,032	9,487	20,121	18,877
Provision expense		175	600	200
Noninterest income	2,369	1,962	5,041	4,741
Noninterest expense	9,061	9,316	18,129	17,898
Tax expense	512	332	973	1,269
Net income	2,828	1,626	5,460	4,251
Assets	1,014,033	968,864	1,014,033	968,864
Consumer Finance [Member]
Net interest income	608	584	2,029	2,059
Provision expense	(23)		133	120
Noninterest income	169	150	573	484
Noninterest expense	613	560	1,353	1,353
Tax expense	39	59	234	363
Net income	148	115	882	707
Assets	$ 11,331	$ 11,292	$ 11,331	$ 11,292