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Stock-Based Compensation (Tables)
3 Months Ended
Oct. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Common stock options granted, forfeited or expired and exercised

    Options   Weighted Average Exercise Price per Share
Outstanding - July 31, 2017     18,095     $ 31.02  
Granted     —         —    
Forfeited or expired     —         —    
Exercised     —         —    
Outstanding - October 31, 2017     18,095     $ 31.02  

Information on stock options outstanding

          Options Outstanding and Options Exercisable
  Range of Exercise Price       Number Outstanding at October 31, 2017       Weighted Average Exercise Price       Weighted Average Remaining Life (Years)       Aggregate Intrinsic Value  
$ 1.00       17,245     $ 1.00       0.79       33,456  
$ 640.00       850     $ 640.00       2.36       —    
          18,095     $ 31.02       0.86     $ 33,456