Note 10 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Consolidated net income	$ 11,373	$ 11,144
Denominator – Weighted average number of common shares outstanding (in shares)	11,276,121	11,079,350
Basic earnings per common share (in dollars per share)	$ 1.01	$ 1.01
Numerator – Earnings available to common stockholders	$ 11,373	$ 11,144
Dilutive effect of stock options (in shares)	31,885	29,216
Weighted average diluted common shares outstanding (in shares)	11,308,006	11,108,566
Diluted earnings per common share (in dollars per share)	$ 1.01	$ 1.00