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Inventories
9 Months Ended
Jan. 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:
   
January 31,
   
April 30,
 
   
2012
   
2011
 
(Amounts in thousands)
         
Raw materials and subassemblies
 
$
1,186
   
$
436
 
Work-in-process
   
3
     
-
 
Finished Goods
   
1,050
     
-
 
   
$
2,239
   
$
436