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Note 16 - Shares Outstanding and Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Weighted average basic shares outstanding (in shares)	11,492	11,447	11,509
Assumed exercise of stock options and issuance of stock awards (in shares)	11	0	0
Weighted average diluted shares outstanding (in shares)	11,503	11,447	11,509
Net income (loss)	$ 121,051	$ (5,595)	$ 3,856
Basic earnings (loss) per share (in dollars per share)	$ 10.53	$ (0.49)	$ 0.34
Diluted earnings (loss) per share (in dollars per share)	$ 10.52	$ (0.49)	$ 0.34
Unvested RSUs (in shares)	206	235	216

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