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Inventories
3 Months Ended
Jul. 31, 2013
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,
 
   
2013
   
2013
 
(Amounts in thousands)
         
Raw materials and subassemblies
 
$
2,355
   
$
2,872
 
Work-in-process
   
183
     
33
 
Finished goods
   
506
     
760
 
   
$
3,044
   
$
3,665