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Note 13 - Shares Outstanding and Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Weighted average basic shares outstanding (in shares)	11,548	11,492	11,543	11,491
Assumed exercise of stock options and issuance of stock awards (in shares)	9	23	5	18
Weighted average diluted shares outstanding (in shares)	11,557	11,515	11,548	11,509
Net income	$ 12,046	$ 44,533	$ 86,972	$ 96,190
Basic earnings per share (in dollars per share)	$ 1.04	$ 3.88	$ 7.53	$ 8.37
Diluted earnings per share (in dollars per share)	$ 1.04	$ 3.87	$ 7.53	$ 8.36
Unvested RSUs (in shares)	176	209	176	209

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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