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Inventories
12 Months Ended
Mar. 31, 2012
Inventories
3.   Inventories
 
Inventories consisted of the following at March 31:

   
2012
   
2011
 
Raw material
  $ 2,342,000     $ 3,204,000  
Work-in-process
    949,000       1,214,000  
Finished products
    303,000       357,000  
Inventories
  $ 3,594,000     $ 4,775,000