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Note 10 - Segment Information - Segment Information Report of Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net sales	$ 28,692	$ 42,061	$ 58,358	$ 75,989
Gross profit (loss)	49	(2,162)	829	(7,599)
Operating loss	(3,522)	(6,253)	(7,464)	(16,289)
Water Transmission Group [Member] | Operating Segments [Member]
Net sales	28,692	39,775	58,349	69,133
Gross profit (loss)	667	(1,272)	1,832	(7,022)
Operating loss	(438)	(2,648)	(1,352)	(9,904)
Tubular Products [Member] | Operating Segments [Member]
Net sales		2,286	9	6,856
Gross profit (loss)	(618)	(890)	(1,003)	(577)
Operating loss	(903)	(1,002)	(1,333)	(898)
Corporate Segment [Member]
Operating loss	$ (2,181)	$ (2,603)	$ (4,779)	$ (5,487)

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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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-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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