Note 7 - EARNINGS PER SHARE - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings per Share
Net Income (Loss)	$ 26,726	$ 27,157
Basic EPS	$ 1.59	$ 1.62
Diluted EPS	$ 1.58	$ 1.60
Weighted average common shares outstanding	16,783,348	16,776,289
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in shares)	127,327	165,843
Weighted average common and common equivalent shares outstanding	16,910,675	16,942,132