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Inventories
3 Months Ended
Jul. 31, 2012
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:
   
July 31,
   
April 30,
 
   
2012
   
2012
 
(Amounts in thousands)
         
Raw materials and subassemblies
 
$
1,422
   
$
1,775
 
Work-in-process
   
61
     
63
 
Finished goods
   
626
     
821
 
   
$
2,109
   
$
2,659