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Product Warranty Liability (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reconciliation of the changes in product warranty liability    
Balance at beginning of period $ 215 $ 202
Expense for product warranties 360 53
Product warranty claims paid (167) (40)
Balance at end of period $ 408 $ 215