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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Mar. 31, 2012
Inventories    
Raw materials $ 3,998 $ 3,241
Work-in-process 417 331
Finished goods 1,560 1,091
Less: reserve (345) (225)
Total $ 5,630 $ 4,438