Note 6 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Income:
Net income	$ 7,626	$ 5,718
Earnings Per Share:
Basic earnings per share (in dollars per share)	$ 1.30	$ 0.98
Diluted earnings per share (in dollars per share)	$ 1.28	$ 0.97
Weighted Average Number of Shares Outstanding:
Basic shares (in shares)	5,855	5,824
Diluted shares (in shares)	5,940	5,920