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Business Segment And Geographic Information (Total Business Segments Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 216,754 $ 255,056
Wind [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 67,111 70,054
Grid [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 72,800 89,091
Corporate Assets [Member]
   
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 76,843 $ 95,911