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Business Segments (Schedule Of Revenues By Major Customers) (Details) | 3 Months Ended
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Jun. 30, 2012 BeiJing JINGCHENG New Energy Co., Ltd. [Member] | Jun. 30, 2012 Karara Mining Limited [Member] | Jun. 30, 2012 INOX Wind Limited. [Member] | Jun. 30, 2011 Department Of Energy [Member] | Jun. 30, 2011 Doosan Heavy Industries & Construction Co Ltd. [Member] | Jun. 30, 2011 Shenyang Blower Works Group Wind Power Co.,Ltd. [Member]
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Revenue percentage | 19.00% | 15.00% | 15.00% | 17.00% | 15.00% | 13.00%

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration