Note 21 - Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2021		Sep. 30, 2021		Jun. 30, 2021		Mar. 31, 2021		Dec. 31, 2020		Sep. 30, 2020		Jun. 30, 2020		Mar. 31, 2020		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unaudited Quarterly Results Of Operations [Abstract]
Interest income	$ 11,938		$ 11,721		$ 11,380		$ 11,731		$ 10,859		$ 10,763		$ 10,740		$ 11,331		$ 46,770	$ 43,693	$ 46,418
Interest expense	1,130		1,137		1,162		1,214		1,338		1,433		1,506		2,168		4,643	6,445	10,124
Net interest income	10,808		10,584		10,218		10,517		9,521		9,330		9,234		9,163		42,127	37,248	36,294
Provision for loan losses					183		275		250		250		250		500		458	1,250	1,300
Non-interest income	2,528		1,315		2,534		3,404		3,547		2,809		2,817		(1,571)		9,781	7,602	8,317
Non-interest expense	8,135		7,790		7,749		7,323		7,611		7,197		6,869		7,278		30,997	28,955	28,104
Income before income taxes	5,201		4,109		4,820		6,323		5,207		4,692		4,932		(186)		20,453	14,645	15,207
Provision for income taxes	1,052		685		951		1,273		1,056		914		998		(406)		3,961	2,562	2,850
Net income	$ 4,149		$ 3,424		$ 3,869		$ 5,050		$ 4,151		$ 3,778		$ 3,934		$ 220		$ 16,492	$ 12,083	$ 12,357
Earnings Per Share - basic	$ 1.17	[1]	$ 0.96	[1]	$ 1.09	[1]	$ 1.42	[1]	$ 1.17	[1]	$ 1.07	[1]	$ 1.11	[1]	$ 0.06	[1]	$ 4.64	$ 3.42	$ 3.53
Earnings Per Share - diluted	$ 1.17	[1]	$ 0.96	[1]	$ 1.09	[1]	$ 1.42	[1]	$ 1.17	[1]	$ 1.07	[1]	$ 1.11	[1]	$ 0.06	[1]	$ 4.64	$ 3.42	$ 3.53

[1] Due to rounding, quarterly earnings per share may not sum to annual earnings per share