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Business Segment And Geographic Information (Total Business Segments Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 255,056	$ 441,209
Wind [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	70,054	78,700
Grid [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	89,091	85,607
Corporate Assets [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 95,911	$ 276,902

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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