Note 28 - Parent Company Financial Statements - Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other income									$ 461	$ 636	$ 314
Total income	$ 1,282	$ 1,076	$ 995	$ 1,471	$ 1,260	$ 990	$ 412	$ 824	4,824	3,486	3,183
Interest expense									4,587	4,778	4,983
Noninterest expense	7,891	7,357	7,726	7,990	7,825	7,156	7,643	9,876	30,964	32,500	24,905
Income before income taxes and equity in undistributed net income of subsidiaries	3,810	4,303	3,144	3,015	2,869	3,110	1,986	(748)	14,272	7,217	12,048
Income tax expense	3,803	1,427	935	763	572	744	430	212	6,928	1,958	3,462
Net income									7,344	5,259	8,586
Less: Preferred stock extinguishment costs											102
Income available to common shareholders	$ 7	$ 2,876	$ 2,209	$ 2,252	$ 2,297	$ 2,366	$ 1,556	$ (960)	7,344	5,259	8,295
Parent Company [Member]
Other income									9	7	6
Dividends from subsidiaries									2,200	4,200	2,850
Total income									2,209	4,207	2,856
Management fees paid to subsidiaries									278	259	229
Interest expense									1,452	1,409	267
Noninterest expense									474	345	337
Total expenses									2,204	2,013	833
Income before income taxes and equity in undistributed net income of subsidiaries									5	2,194	2,023
Income tax expense									1	1	1
Income before equity in undistributed net income of subsidiaries									4	2,193	2,022
Equity in undistributed net income of subsidiaries									7,340	3,066	6,564
Net income									7,344	5,259	8,586
Less: Preferred stock extinguishment costs											102
Less: Preferred dividends											189
Income available to common shareholders									$ 7,344	$ 5,259	$ 8,295