Note 11 - Earnings Per Common Share - Earnings Per Common Share (Details) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic earnings per share (in shares)	10,754,287	10,971,466
Basic earnings per share (in dollars per share)	$ 0.84	$ 1.03
Effect of dilutive securities - stock options (in shares)	2,615	4,711
Effect of dilutive securities - stock options (in dollars per share)	$ 0	$ 0
Diluted earnings per share (in shares)	10,756,902	10,976,177
Diluted earnings per share (in dollars per share)	$ 0.84	$ 1.03