Note 27 - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Net interest income	$ 12,494	$ 12,127	$ 11,580	$ 11,345	$ 10,869	$ 10,584	$ 10,175	$ 9,734	$ 47,546		$ 41,362		$ 36,231
Total income	1,132	943	962	982	1,282	1,076	995	1,471	4,019		4,824		3,486
Noninterest expense	8,868	7,634	7,671	8,033	7,891	7,357	7,726	7,990	32,206		30,964		32,500
Income before income taxes and equity in undistributed net income of subsidiaries	4,758	5,436	4,871	4,294	3,810	4,303	3,144	3,015	19,359		14,272		7,217
Income tax expense	(81)	1,404	1,253	1,053	3,803	1,427	935	763	3,629		6,928		$ 1,958
Income available to common shareholders	$ 4,839	$ 4,032	$ 3,618	$ 3,241	$ 7	$ 2,876	$ 2,209	$ 2,252	$ 15,730		$ 7,344
Earnings per share - basic (in dollars per share)	$ 0.30	$ 0.25	$ 0.22	$ 0.20		$ 0.18	$ 0.15	$ 0.17	$ 0.97		$ 0.48
Weighted average shares - basic (in shares)	16,265	16,252	16,245	16,225	16,195	16,191	15,014	13,416	16,248	[1]	15,207	[1]	13,367	[1]
Earnings per share - diluted (in dollars per share)	$ 0.30	$ 0.25	$ 0.22	$ 0.20		$ 0.18	$ 0.15	$ 0.17	$ 0.96		$ 0.48
Weighted average shares - diluted (in shares)	16,345	16,342	16,325	16,310	16,306	16,288	15,113	13,521	16,332		15,310		13,425
Provision for loan and lease losses					$ 450		$ 300	$ 200			$ 950

[1] Excludes unvested restricted shares because they do not have dividend or voting rights.