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Business Segments (Operating Results For Two Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Revenues	$ 28,716	$ 9,058
Operating (loss) income	(6,128)	(38,327)
Wind [Member]
Segment Reporting Information [Line Items]
Revenues	16,511	4,262
Operating (loss) income	1,301	(24,370)
Grid [Member]
Segment Reporting Information [Line Items]
Revenues	12,205	4,796
Operating (loss) income	(5,343)	(10,552)
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating (loss) income	$ (2,086)	$ (3,405)

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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X

- Definition

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=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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