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Note 2 - Revenues (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer, Including Assessed Tax	$ 40,389	$ 54,614	$ 119,608	$ 158,174
Transferred over Time [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,475		1,475
Transferred over Time [Member] | Heavy Fabrications [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,791		4,220
Transferred over Time [Member] | Gearing [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 499		$ 2,444

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
-Publisher FASB
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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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