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Earnings Per Share (Tables)
6 Months Ended
Jan. 31, 2021
Earnings Per Share [Abstract]  
Schedule of weighted-average number of shares calculation of basic and diluted earnings per share
   Three Months Ended
January 31,
   Six Months Ended
January 31,
 
   2021   2020   2021   2020 
   (in thousands) 
Basic weighted-average number of shares   12,633    10,229    12,412    10,212 
Effect of dilutive securities:                    
Stock options   698    371    472    - 
Non-vested restricted Class B common stock   73    3    44    - 
Deferred stock units   27    12    21    - 
Diluted weighted-average number of shares   13,431    10,615    12,949    10,212 
Schedule of shares excluded from the dilutive earnings per share computations
   Three Months Ended
January 31,
   Six Months Ended
January 31,
 
   2021   2020   2021   2020 
   (in thousands) 
Stock options   14    937    215    1,330 
Non-vested restricted Class B common stock   -    141    -    172 
Deferred stock units   -    -    -    93 
Shares excluded from the calculation of diluted earnings per share   14    1,078    215    1,595