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Organization and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Oct. 31, 2014
Organization, Consolidation and Presentation Of Financial Statements [Abstract]  
Schedule of levels of fair value measurements of investments
    As of October 31, 2014  
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $ 4,857     $ -     $ -     $ 4,857  
Securities available-for-sale
    9,223       -       -       9,223  
    $ 14,080     $ -     $ -     $ 14,080  
 
  As of April 30, 2014  
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $ 5,482     $ -     $ -     $ 5,482  
Securities available-for-sale
    9,226       -       -       9,226  
    $ 14,708     $ -     $ -     $ 14,708