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MARKETABLE SECURITIES (Schedule of Investment Income) (Details) - USD ($) | 12 Months Ended
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Jul. 31, 2021 | Jul. 31, 2020
Investments, Debt and Equity Securities [Abstract] |  |
Interest income | $ 850 | $ 20,446
Dividend income | 98,915 | 96,569
Gain on sale of marketable securities | 73,783 | 28,546
Total | $ 173,548 | $ 145,561

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