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Inventories (Tables)
6 Months Ended
Oct. 31, 2012
Inventories [Abstract]  
Inventories
                 
    October 31, 2012     April 30, 2012  

Finished products

  $ 3,642     $ 3,570  

Work in process

    1,792       1,831  

Raw materials

    6,990       6,359  
   

 

 

   

 

 

 
    $ 12,424     $ 11,760