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Business Segments (Total Business Segments Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 264,178	$ 255,056
Wind [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	66,598	70,054
Grid [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	82,006	89,091
Corporate Assets [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 115,574	$ 95,911

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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