Note 11 - Earnings Per Common Share - Earnings Per Common Share (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic earnings per share (in shares)	10,640,952	10,833,875	10,694,096	10,907,721
Basic earnings per share (in dollars per share)	$ 0.87	$ 0.94	$ 2.47	$ 2.96
Effect of dilutive securities - stock options (in shares)	2,121	2,418	2,313	3,651
Effect of dilutive securities - stock options (in dollars per share)	$ 0	$ 0	$ 0	$ (0.01)
Diluted earnings per share (in shares)	10,643,073	10,836,293	10,696,409	10,911,372
Diluted earnings per share (in dollars per share)	$ 0.87	$ 0.94	$ 2.47	$ 2.95