Note 19 - Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Interest income	$ 11,479	$ 11,506	$ 11,462	$ 11,609	$ 11,718	$ 11,693	$ 11,234	$ 10,440	$ 46,056	$ 45,085
Interest expense	2,170	2,455	2,508	2,663	2,581	2,438	1,997	1,562	9,796	8,578
Net interest income	9,309	9,051	8,954	8,946	9,137	9,255	9,237	8,878	36,260	36,507
Provision for loan and lease losses	(33)	637	347	(154)	(199)	1,149	880	720	797	2,550
Net interest income after (credit) provision for loan and lease losses	9,342	8,414	8,607	9,100	9,336	8,106	8,357	8,158	35,463	33,957
Non-interest income	2,696	1,831	1,578	1,515	7,422	1,320	1,529	1,519	7,620	11,790
Non-interest expense	7,806	7,329	7,122	7,425	7,941	7,188	6,966	7,232	29,682	29,327
Income before income taxes	4,232	2,916	3,063	3,190	8,817	2,238	2,920	2,445	13,401	16,420
Income tax expense	744	513	514	555	1,749	388	508	426	$ 2,326	$ 3,071
Net income	$ 3,488	$ 2,403	$ 2,549	$ 2,635	$ 7,068	$ 1,850	$ 2,412	$ 2,019
Basic (in dollars per share)	$ 0.17	$ 0.12	$ 0.13	$ 0.14	$ 0.42	$ 0.11	$ 0.14	$ 0.12	$ 0.56	$ 0.79
Diluted (in dollars per share)	$ 0.17	$ 0.12	$ 0.13	$ 0.14	$ 0.42	$ 0.11	$ 0.14	$ 0.12	$ 0.56	$ 0.79