Note 2 - Revenues (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenue from Contract with Customer, Including Assessed Tax	$ 37,616	$ 48,873	$ 48,873
Heavy Fabrications [Member] \| Transferred over Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 280	$ 3,669

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details