Note 12 - Earnings Per Common Share - Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Weighted average number of common shares outstanding used in basic earnings per share calculation (in shares)	4,432,447	4,628,292	4,494,761	4,624,266
Restricted stock awards and options (in shares)	33,421	22,550	33,122	25,312
Weighted average number of shares outstanding adjusted for effect of dilutive securities (in shares)	4,465,868	4,650,842	4,527,883	4,649,578
Net income	$ 3,619	$ 3,101	$ 11,565	$ 7,177
Basic earnings per share (in dollars per share)	$ 0.82	$ 0.67	$ 2.57	$ 1.55
Diluted earnings per share (in dollars per share)	$ 0.81	$ 0.67	$ 2.55	$ 1.54