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Net Income Per Share (Details Textuals) - shares
12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Stock Options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,090,250 1,575,167 3,045,000