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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, 2021	Mar. 31, 2020
Weighted average basic shares outstanding (in shares)	11,490	11,444
Assumed issuance of stock awards (in shares)	6	15
Weighted average diluted shares outstanding (in shares)	11,496	11,459
Net income	$ 22,008	$ 593
Basic earnings per share (in dollars per share)	$ 1.92	$ 0.05
Diluted earnings per share (in dollars per share)	$ 1.91	$ 0.05
Unvested RSUs (in shares)	214	255

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