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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Weighted average basic shares outstanding (in shares)	11,538	11,492	11,536	11,491
Assumed exercise of stock options and issuance of stock awards (in shares)	7	12	4	10
Weighted average diluted shares outstanding (in shares)	11,545	11,504	11,540	11,501
Net income	$ 37,624	$ 29,649	$ 74,926	$ 51,657
Basic earnings per share (in dollars per share)	$ 3.26	$ 2.58	$ 6.49	$ 4.50
Diluted earnings per share (in dollars per share)	$ 3.26	$ 2.58	$ 6.49	$ 4.49
Unvested RSUs (in shares)	196	210	196	210

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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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