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Intangible Assets (Schedule Of Business Segment Composition Of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Intangible assets $ 2,749 $ 3,772
Wind [Member]
   
Intangible assets 152 1,119
Grid [Member]
   
Intangible assets $ 2,597 $ 2,653