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Note 2 - Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 40,389	$ 54,614	$ 119,608	$ 158,174
Consolidation, Eliminations [Member]
Revenues	(61)	(32)	(346)	(39)
Heavy Fabrications [Member] | Operating Segments [Member]
Revenues	28,675	43,440	87,282	125,424
Gearing [Member] | Operating Segments [Member]
Revenues	7,562	7,125	20,315	20,273
Industrial Solutions [Member] | Operating Segments [Member]
Revenues	$ 4,213	$ 4,081	$ 12,357	$ 12,516

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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