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Note 10 - Segment Information - Segment Information Report of Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net sales	$ 29,666	$ 33,928
Gross profit (loss)	780	(5,437)
Operating loss	(3,941)	(10,036)
Water Transmission Group [Member] | Operating Segments [Member]
Net sales	29,657	29,358
Gross profit (loss)	1,165	(5,750)
Operating loss	(914)	(7,256)
Tubular Products [Member] | Operating Segments [Member]
Net sales	9	4,570
Gross profit (loss)	(385)	313
Operating loss	(430)	104
Corporate Segment [Member]
Operating loss	$ (2,597)	$ (2,884)

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

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+ References

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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