Note 18 - Condensed Financial Information - Parent Company Only - Condensed Statements of Income (Details) - USD ($) $ 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 on interest-bearing deposits in other banks									$ 188	$ 88
Income from trust									13	12
Subordinated debentures									24	228
Junior subordinated debentures									430	400
Other operating expenses									4,962	4,481
Other losses									156	598
Total expenses	$ 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
Income before equity in undistributed net income of subsidiary									11,075	13,349
Net income	$ 3,488	$ 2,403	$ 2,549	$ 2,635	$ 7,068	$ 1,850	$ 2,412	$ 2,019
Parent Company [Member]
Dividends from subsidiaries									10,000	12,180
Interest on interest-bearing deposits in other banks									77	3
Income from trust									13	12
Total income									10,090	12,195
Subordinated debentures									24	228
Junior subordinated debentures									430	400
Other operating expenses									275	353
Other losses										32
Total expenses									729	1,013
Income before income taxes									9,361	11,182
Income tax expense
Income before equity in undistributed net income of subsidiary									9,361	11,182
Equity in undistributed net income of subsidiary									1,714	2,167
Net income									$ 11,075	$ 13,349