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Stock-Based Compensation (Tables)
6 Months Ended
Jan. 31, 2018
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 - January 31, 2018     18,095     $ 31.02  

Information on stock options outstanding

          Options Outstanding and Options Exercisable  
  Range of Exercise Price      

Number Outstanding at January 31,

2018

      Weighted Average Exercise Price       Weighted Average Remaining Life (Years)       Aggregate Intrinsic Value  
$ 1.00       17,245     $ 1.00       0.53       47,424  
$ 640.00       850     $ 640.00       2.10       —    
          18,095     $ 31.02       0.61     $ 47,424