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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Inventories    
Raw materials $ 4,298 $ 4,052
Work-in-process 349 271
Finished goods 1,813 1,514
Less: reserve (371) (261)
Total $ 6,089 $ 5,576