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Summary of Significant Accounting and Reporting Policies (Adoption of New Accounting Pronouncements) (Details) - USD ($)
Jul. 31, 2021
Jul. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Allowance for doubtful acconts $ 1,648,000 $ 1,769,000
Cumulative Effect, Period of Adoption, Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Allowance for doubtful acconts   $ 215,000