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Inventories (Tables)
6 Months Ended
Oct. 31, 2012
Inventories [Abstract]  
Inventories
Inventories consisted of the following:
   
October 31,
   
April 30,
 
   
2012
   
2012
 
(Amounts in thousands)
         
Raw materials and subassemblies
 
$
1,230
   
$
1,775
 
Work-in-process
   
-
     
63
 
Finished goods
   
305
     
821
 
   
$
1,535
   
$
2,659