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, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted average basic shares outstanding (in shares)	11,551	11,492	11,447
Assumed exercise of stock options and issuance of stock awards (in shares)	8	11	0
Weighted average diluted shares outstanding (in shares)	11,559	11,503	11,447
Net income (loss)	$ 90,931	$ 121,051	$ (5,595)
Basic earnings (loss) per share (in dollars per share)	$ 7.87	$ 10.53	$ (0.49)
Diluted earnings (loss) per share (in dollars per share)	$ 7.87	$ 10.52	$ (0.49)
Unvested RSUs and PSUs (in shares)	194	206	235