Note 18 - Earnings per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings per Share
Net income	$ 99,066	$ 98,905	$ 60,582
Basic EPS	$ 5.94	$ 6.30	$ 3.84
Diluted EPS	$ 5.87	$ 6.20	$ 3.80
Weighted average common shares outstanding	16,681,844	15,708,744	15,771,650
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in shares)	208,163	235,964	180,987
Weighted average common and common equivalent shares outstanding (in shares)	16,890,007	15,944,708	15,952,637