Note 15 - Earnings Per Common Share - Earnings Per Common Share (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic earnings per share (in shares)	10,627,709	10,672,314	10,873,817
Basic earnings per share (in dollars per share)	$ 2.46	$ 3.23	$ 4
Effect of dilutive securities - stock options (in shares)	850	2,299	3,414
Effect of dilutive securities - stock options (in dollars per share)	$ 0	$ 0	$ 0
Diluted earnings per share (in shares)	10,628,559	10,674,613	10,877,231
Diluted earnings per share (in dollars per share)	$ 2.46	$ 3.23	$ 4