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Product Warranty Liability (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Product Warranty Liability (Textual) [Abstract]        
(Income) expense for product warranties $ 65 $ (5) $ 73 $ 67