Note 19 - Earnings per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings per Share
Net Income (Loss)	$ 113,558	$ 99,066	$ 98,905
Basic EPS	$ 6.79	$ 5.94	$ 6.30
Diluted EPS	$ 6.73	$ 5.87	$ 6.20
Weighted average common shares outstanding	16,732,406	16,681,844	15,708,744
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in shares)	133,985	208,163	235,964
Weighted average common and common equivalent shares outstanding	16,866,391	16,890,007	15,944,708