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Note 7 - Segment Information Report of Statements of Operations (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Water Transmission Group [Member] | Operating Segments [Member]
Net sales:
Net Sales		$ 39,775	$ 38,445	$ 69,133	$ 94,687
Gross profit (loss):
Gross profit (loss)		(1,272)	1,255	(7,022)	8,774
Operating loss:
Operating Income (loss)	[1]	(2,648)	(5,815)	(9,904)	(182)
Tubular Products [Member] | Operating Segments [Member]
Net sales:
Net Sales		2,286	15,401	6,856	44,024
Gross profit (loss):
Gross profit (loss)		(890)	(3,848)	(577)	(7,476)
Operating loss:
Operating Income (loss)		(1,002)	(4,254)	(898)	(8,871)
Corporate Segment [Member]
Operating loss:
Operating Income (loss)		(2,603)	(3,258)	(5,487)	(7,357)
Net Sales		42,061	53,846	75,989	138,711
Gross profit (loss)		(2,162)	(2,593)	(7,599)	1,298
Operating Income (loss)		$ (6,253)	$ (13,327)	$ (16,289)	$ (16,410)
[1] Operating loss for the Water Transmission Group for the three and six months ended June 30, 2015 includes the write-off of Water Transmission goodwill of $5.3 million.

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- 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)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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