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Note 7 - EARNINGS PER SHARE - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
EARNINGS PER SHARE            
Net Income (Loss) $ 29,114 $ 26,726 $ 28,425 $ 27,157 $ 55,840 $ 55,582
Basic EPS $ 1.73   $ 1.70   $ 3.32 $ 3.32
Diluted EPS $ 1.72   $ 1.69   $ 3.30 $ 3.29
Weighted average common shares outstanding (in shares) 16,814,814   16,701,950   16,799,081 16,739,120
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in shares) 107,040   97,577   117,183 131,710
Weighted average common and common equivalent shares outstanding 16,921,854   16,799,527   16,916,264 16,870,830