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Concentration of Customers (Tables)
3 Months Ended
Oct. 31, 2014
Concentration of Customers [Abstract]  
Scheudle of revenues from transactions with single customer

  Three Months Ended 
October 31,
 
  2014  2013 
  (in thousands) 
Customer 1 $41  $41 
Customer 2  24   31 
Customer 3  10   15