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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
	Mar. 31, 2022	Mar. 31, 2021
Weighted average basic shares outstanding (in shares)	11,559	11,490
Assumed issuance of stock awards (in shares)	4	6
Weighted average diluted shares outstanding (in shares)	11,563	11,496
Net income	$ 37,302	$ 22,008
Basic earnings per share (in dollars per share)	$ 3.23	$ 1.92
Diluted earnings per share (in dollars per share)	$ 3.23	$ 1.91
Unvested RSUs (in shares)	201	214

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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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