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Stock-Based Compensation (Tables)
9 Months Ended
Apr. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Common stock options granted, forfeited or expired and exercised

The following is a summary of the common stock options granted, forfeited or expired and exercised under the Plan:

    Options   Weighted Average Exercise Price per Share
Outstanding - July 31, 2017     18,095     $ 31.02  
Granted     —         —    
Forfeited or expired     (4,730 )     1.00  
Exercised     —         —    
Outstanding - April 30, 2018     13,365     $ 41.64  
Information on stock options outstanding

The following table summarizes information on stock options outstanding at April 30, 2018: 

          Options Outstanding and Options Exercisable  
  Range of Exercise Price      

Number Outstanding at April 30,

2018

      Weighted Average Exercise Price       Weighted Average Remaining Life (Years)       Aggregate Intrinsic Value  
$ 1.00       12,515     $ 1.00       0.43       24,404  
$ 640.00       850     $ 640.00       1.86       —    
          13,365     $ 41.64       0.52     $ 24,404