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Inventories (Tables)
 3 Months Ended
Jul. 31, 2014
Inventories [Abstract]  
Inventories
Inventories consisted of the following:
   
July 31,
   
April 30,
 
   
2014
   
2014
 
(Amounts in thousands)
         
Raw materials and subassemblies
 
$
1,222
   
$
1,082
 
Work-in-process
   
5
     
13
 
Finished goods
   
22
     
303
 
   
$
1,249
   
$
1,398