Note 11 - Earnings Per Common Share - Earnings Per Common Share (Details) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic earnings per share (in shares)	10,630,571	10,754,287
Basic earnings per share (in dollars per share)	$ 0.86	$ 0.84
Effect of dilutive securities - stock options (in shares)	2,110	2,615
Effect of dilutive securities - stock options (in dollars per share)	$ 0	$ 0
Diluted earnings per share (in shares)	10,632,681	10,756,902
Diluted earnings per share (in dollars per share)	$ 0.86	$ 0.84