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Organization and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Jul. 31, 2015
Organization, Consolidation and Presentation Of Financial Statements [Abstract]  
Schedule of levels of fair value measurements of investments
                           
    As of July 31, 2015  
($ in thousands)   Level 1   Level 2   Level 3   Total  
Cash equivalents   $ 5,605   $ -   $ -   $ 5,605  
Securities available-for-sale     9,627     -     -     9,627  
    $ 15,232   $ -   $ -   $ 15,232  

 

                                 
    As of April 30, 2015  
($ in thousands)   Level 1     Level 2     Level 3     Total  
Cash equivalents   $ 5,272     $ -     $ -     $ 5,272  
Securities available-for-sale     9,632       -       -       9,632  
    $ 14,904     $ -     $ -     $ 14,904