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Product Warranty Liability (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Reconciliation of the changes in the product warranty    
Balance at beginning of period $ 215 $ 202
Expense for product warranties 11 33
Product warranty claims paid (32) (18)
Balance at end of period $ 194 $ 217