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Inventories
6 Months Ended
Oct. 31, 2011
Inventories [Abstract]  
Inventories
Inventories

Inventories are stated at the lower of cost or the current estimated market values. Cost is determined using the first-in, first-out method.  

Inventories consisted of the following:
   
October 31,
   
April 30,
 
   
2011
   
2011
 
(Amounts in thousands)
         
Raw materials and subassemblies
 
$
1,713
   
$
436
 
Work-in-process
   
9
     
-
 
   
$
1,722
   
$
436