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Note 2 - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 46,491	$ 54,926	$ 79,219	$ 103,560
Consolidation, Eliminations [Member]
Revenues	(284)	(7)	(286)	(7)
Heavy Fabrications [Member] | Operating Segments [Member]
Revenues	35,830	43,614	58,607	81,983
Gearing [Member] | Operating Segments [Member]
Revenues	7,404	6,922	12,753	13,149
Industrial Solutions [Member] | Operating Segments [Member]
Revenues	$ 3,541	$ 4,397	$ 8,145	$ 8,435

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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