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MARKETABLE SECURITIES | 12 Months Ended
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Jul. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES | 2. MARKETABLE SECURITIES: As of July 31, 2021 and 2020, the Company’s marketable securities were classified as follows:
| July 31, 2021 |  | July 31, 2020
|  |  | Gross |  | Gross |  |  |  |  |  | Gross |  | Gross |  |
|  |  | Unrealized |  | Unrealized |  | Fair |  |  |  | Unrealized |  | Unrealized |  | Fair
| Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds | $ | 984,869 |  | $ | 619,972 |  |  | $ | — |  |  | $ | 1,604,841 |  | $ | 1,077,493 |  | $ | 297,064 |  |  | $ | — |  |  | $ | 1,374,557
Corporate equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
securities |  | 1,355,961 |  |  | 940,291 |  |  |  | — |  |  |  | 2,296,252 |  |  | 1,553,275 |  |  | 823,010 |  |  |  | 5,937 |  |  |  | 2,370,348
| $ | 2,340,830 |  | $ | 1,560,263 |  |  | $ | — |  |  | $ | 3,901,093 |  | $ | 2,630,768 |  | $ | 1,120,074 |  |  | $ | 5,937 |  |  | $ | 3,744,905
Investment income for the years ended July 31, 2021 and 2020 consists of the following:
| 2021 |  | 2020
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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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