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Inventories (Tables)
 6 Months Ended
Oct. 31, 2014
Inventories [Abstract]  
Inventories
Inventories consisted of the following:
   
October 31,
   
April 30,
 
   
2014
   
2014
 
(Amounts in thousands)
         
Raw materials and subassemblies
 
$
856
   
$
1,082
 
Work-in-process
   
142
     
13
 
Finished goods
   
702
     
303
 
   
$
1,700
   
$
1,398