Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - Trade Accounts Receivable [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024		Dec. 31, 2023	Dec. 31, 2022
Balance	$ 15,914		$ 14,060	$ 74,404
Current period provision for expected credit losses	(1,430)		3,305	414
Acquisition of Sonatide joint venture				(59,678)
Other	(331)		(457)	(1,080)
Write offs	(10,969)	[1]	(1,484)
Recoveries			490
Balance	$ 3,184		$ 15,914	$ 14,060

[1] Primarily the write off of the remaining balance due from our Nigerian joint venture.