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Defined Contribution Plan (Details) - USD ($) | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
Defined Contribution Plan (Details) [Line Items] |  |
Cost contribution | $ 39,000 | $ 41,000
Class B Common Stock [Member] |  |
Defined Contribution Plan (Details) [Line Items] |  |
Cash contributions | 6,572 | 26,193

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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 + Details
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- Details
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