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Intangible Assets
3 Months Ended
Jul. 31, 2011
Intangible Assets [Abstract]  
Intangible Assets
(6) Intangible Assets:
Intangible assets consisted of the following as of July 31, 2011 and April 30, 2011 (in thousands):
                 
    July 31, 2011        
    (Unaudited)     April 30, 2011  
Developed technology
  $ 3,120     $ 3,120  
Customer relationships
    100       100  
Patents, trademarks, and tradenames
    7,063       7,036  
Software
    542       542  
 
           
 
    10,825       10,798  
Less: Accumulated amortization
    (2,388 )     (2,106 )
 
           
Total intangible assets, net
  $ 8,437     $ 8,692