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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Weighted average basic shares outstanding (in shares)	11,492	11,452	11,491	11,447
Assumed exercise of stock options and issuance of stock awards (in shares)	23	0	18	0
Weighted average diluted shares outstanding (in shares)	11,515	11,452	11,509	11,447
Net income (loss)	$ 44,533	$ (1,520)	$ 96,190	$ (7,381)
Basic earnings per share (in dollars per share)	$ 3.88	$ (0.13)	$ 8.37	$ (0.64)
Diluted earnings per share (in dollars per share)	$ 3.87	$ (0.13)	$ 8.36	$ (0.64)
Unvested RSUs (in shares)	209	234	209	234

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