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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Weighted average basic shares outstanding (in shares)	11,492	11,446	11,491	11,445
Assumed exercise of stock options and issuance of stock awards (in shares)	12	0	10	0
Weighted average diluted shares outstanding (in shares)	11,504	11,446	11,501	11,445
Net income (loss)	$ 29,649	$ (6,454)	$ 51,657	$ (5,861)
Basic earnings per share (in dollars per share)	$ 2.58	$ (0.56)	$ 4.50	$ (0.51)
Diluted earnings per share (in dollars per share)	$ 2.58	$ (0.56)	$ 4.49	$ (0.51)
Unvested RSUs (in shares)	210	236	210	236

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