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Stock-Based Compensation (Tables)
12 Months Ended
Jul. 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, 2016     19,639       30.00  
Forfeited or expired     (1,544 )     1.00  
Outstanding - July 31, 2017     18,095     $ 31.02  
Granted     —         —    
Forfeited or expired     (7,037 )     (5.56 )
Exercised     —         —    
Outstanding - July 31, 2018     11,058     $ 30.63  

Information on stock options outstanding

    Options Outstanding and Options Exercisable
Range of Exercise Price   Number Outstanding at July 31, 2018   Weighted Average Exercise Price   Weighted Average Remaining Life (Years)   Aggregate Intrinsic Value
$ 1.00       10,208     $ 1.00       .25      $ 10,719  
$ 640.00       850     $ 640.00       1.61       —    
          11,058                      $ 10,719