Note 6 - Earnings Per Share - Computation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net income available to common shareholders	$ 7,040	$ 7,522
Weighted-average common shares outstanding (in shares)	5,649,623	5,655,192
Basic EPS (in dollars per share)	$ 1.25	$ 1.33
Weighted Average Number of Shares Outstanding, Diluted, Adjustment (in shares)	42,480	38,545
Weighted-average common and potentially dilutive shares outstanding (in shares)	5,692,103	5,693,737
Diluted EPS (in dollars per share)	$ 1.24	$ 1.32