Note 2 - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenues	$ 37,616	$ 48,873	$ 48,873
Consolidation, Eliminations [Member]
Revenues	(731)	(108)	(108)
Heavy Fabrications [Member] \| Operating Segments [Member]
Revenues	22,016	31,593	31,593
Gearing [Member] \| Operating Segments [Member]
Revenues	8,337	11,965	11,965
Industrial Solutions [Member] \| Operating Segments [Member]
Revenues	$ 7,994	$ 5,423	$ 5,423

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