Note 2 - Earnings Per Common Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 2,237	$ 2,436	$ 1,934	$ 2,174	$ 4,673	$ 4,108
Preferred stock dividends	102		95		102	95
Net income available to common stockholders	$ 2,135		$ 1,839		$ 4,571	$ 4,013
Average common shares outstanding - basic (in shares)	2,735,212		2,721,212		2,735,212	2,721,212
Add: Dilutive effects of restricted stock awards (in shares)	30,701		23,132		27,124	21,057
Average shares and dilutive potential common shares (in shares)	2,765,913		2,744,344		2,762,336	2,742,269
Basic earnings per common share (in dollars per share)	$ 0.78		$ 0.68		$ 1.67	$ 1.47
Diluted earnings per common share (in dollars per share)	$ 0.77		$ 0.67		$ 1.65	$ 1.46