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Note 5 Inventories
6 Months Ended
Sep. 30, 2012
Inventory Net [Abstract]  
Inventory Disclosure [Text Block]

5. Inventories

Inventories consist of the following (in thousands):

  September 30, March 31,
  2012 2012
       
  (unaudited)
 Raw materials$ 21,438 $ 23,200
 Work in process  41,345   41,570
 Finished goods  26,800   21,470
  Total$ 89,583 $ 86,240