Note 19 - Condensed Statement 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	Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]
Securities gains (losses)									$ 1,781	$ (79)
Net unrealized gain (loss) on investment equity securities									770	(336)
Provision for income taxes	$ 623	$ 731	$ 679	$ 817	$ (339)	$ 767	$ 572	$ 557	2,850	1,557	$ 5,900
Net income	$ 2,745	$ 3,090	$ 3,143	$ 3,379	$ 2,327	$ 3,211	$ 2,862	$ 2,935	12,357	11,335	8,289
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Dividends from subsidiary									3,820	4,027	3,382
Interest, dividend and other income									292	266	183
Securities gains (losses)									1,781	(79)	1,477
Net unrealized gain (loss) on investment equity securities									770	(336)
Total income									6,663	3,878	5,042
Expenses									420	513	301
Income before applicable income taxes and equity in undistributed income of subsidiary									6,243	3,365	4,741
Provision for income taxes									714	(256)	554
Income before equity in undistributed income of subsidiary									5,529	3,621	4,187
Equity in undistributed income of subsidiary									6,828	7,714	4,102
Net income									$ 12,357	$ 11,335	$ 8,289