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Earnings Per Share (Tables)
3 Months Ended
Oct. 31, 2020
Earnings Per Share [Abstract]  
Schedule of weighted-average number of shares calculation of basic and diluted earnings per share
   Three Months Ended
October 31,
 
   2020   2019 
   (in thousands) 
Basic weighted-average number of shares   12,191    10,196 
Effect of dilutive securities:          
Stock options   292    - 
Non-vested restricted Class B common stock   11    - 
Deferred stock units   2    - 
Diluted weighted-average number of shares   12,496    10,196 
Schedule of shares excluded from the dilutive earnings per share computations
   Three Months Ended
October 31,
 
   2020   2019 
   (in thousands) 
Stock options   917    1,231 
Non-vested restricted Class B common stock   34    154 
Deferred stock units   -    90 
Shares excluded from the calculation of diluted earnings per share   951    1,475