Note 18 - Condensed Financial Information - Parent Company Only - Condensed Statements of Income (Details) - USD ($) $ 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
Interest on interest-bearing deposits in other banks									$ 88	$ 180
Income from trust									12	9
Interest on subordinated notes									228	380
Interest on junior subordinated debt									400	300
Other operating expenses									3,709	3,390
Other losses									598	503
Total expenses	$ 7,941	$ 7,188	$ 6,966	$ 7,232	$ 7,804	$ 6,397	$ 6,940	$ 6,928	29,327	28,069
Income before income taxes	8,817	2,238	2,920	2,445	2,631	3,099	2,702	3,003	16,420	11,435
Income tax expense	1,749	388	508	426	8,745	827	910	806	3,071	11,288
Income before equity in undistributed net income of subsidiary									13,349	147
Net income	$ 7,068	$ 1,850	$ 2,412	$ 2,019	$ (6,114)	$ 2,272	$ 1,792	$ 2,197
Parent Company [Member]
Dividends from subsidiaries									12,180	8,698
Interest on interest-bearing deposits in other banks									3
Income from trust									12	9
Total income									12,195	8,707
Interest on subordinated notes									228	380
Interest on junior subordinated debt									400	300
Other operating expenses									353	162
Other losses									32	113
Total expenses									1,013	955
Income before income taxes									11,182	7,752
Income tax expense
Income before equity in undistributed net income of subsidiary									11,182	7,752
Equity in undistributed net income of subsidiary									2,167	(7,605)
Net income									$ 13,349	$ 147