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Business Segments (Tables) | 9 Months Ended
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Dec. 31, 2012
Business Segments [Abstract] |
Operating Results For Two Business Segments |
|  | Three months ended |  |  | Nine months ended
|  | December 31, |  |  | December 31,
|  | 2012 |  | 2011 |  |  | 2012 |  | 2011
Revenues: |  |  |  |  |  |  |  |  |
Wind | $ | 6,808 | $ | 10,125 |  | $ | 35,321 | $ | 27,836
Grid |  | 10,609 |  | 7,933 |  |  | 31,679 |  | 20,080
Total | $ | 17,417 | $ | 18,058 |  | $ | 67,000 | $ | 47,916
|  | Three months ended |  |  | Nine months ended
|  | December 31, |  |  | December 31,
|  | 2012 |  | 2011 |  |  | 2012 |  | 2011
Operating (loss) income: |  |  |  |  |  |  |  |  |
Wind | $ | (5,365) | $ | (14,014) |  | $ | (10,514) | $ | (54,719)
Grid |  | (6,705) |  | (6,313) |  |  | (18,620) |  | (24,511)
Unallocated corporate expenses |  | (8,546) |  | (6,242) |  |  | (12,580) |  | (36,790)
Total | $ | (20,616) | $ | (26,569) |  | $ | (41,714) | $ | (116,020)
Total Business Segments Assets |
|  | December 31, |  |  | March 31,
|  | 2012 |  |  | 2012
Wind | $ | 69,221 |  | $ | 70,054
Grid |  | 72,714 |  |  | 89,091
Corporate assets |  | 83,384 |  |  | 95,911
Total | $ | 225,319 |  | $ | 255,056
Schedule Of Revenues By Major Customers |
| Three months ended |  |  | Nine months ended |
| December 31, |  |  | December 31, |
| 2012 |  | 2011 |  |  | 2012 |  | 2011 |
CG Power Solutions UK Ltd. | 20.8 | % | - | % |  | < 10 | % | - | %
E.ON Climate & Renewables | 19.4 | % | - | % |  | < 10 | % | - | %
INOX Wind Limited | 18.9 | % | 26.5 | % |  | 17.3 | % | 20.5 | %
Beijing JINGCHENG New Energy Co., Ltd. | < 10 | % | < 10 | % |  | 16.7 | % | < 10 | %
Doosan Heavy Industries & Construction Co Ltd. | < 10 | % | 12.1 | % |  | < 10 | % | 14.8 | %
Ergon Energy Corporation Limited | - | % | 10.6 | % |  | - | % | < 10 | %

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 39 + Details
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