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Note 14 - Shares Outstanding and Earnings Per Share - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Weighted average basic shares outstanding (in shares) 11,569 11,538 11,570 11,536
Assumed exercise of stock options and issuance of stock awards (in shares) 3 7 2 4
Weighted average diluted shares outstanding (in shares) 11,572 11,545 11,572 11,540
Net income $ 15,019 $ 37,624 $ 24,891 $ 74,926
Basic earnings per share (in dollars per share) $ 1.30 $ 3.26 $ 2.15 $ 6.49
Diluted earnings per share (in dollars per share) $ 1.30 $ 3.26 $ 2.15 $ 6.49
Unvested RSUs (in shares) 226 196 226 196