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Changes in the derivative liability (Details) - USD ($) | 3 Months Ended
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Oct. 31, 2021 | Jul. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Derivative liability at April 30, 2021 | $ 2,495,378 | $ 2,812,767
Eliminated upon exercise of warrants |  | (163,141)
Changes in fair value, primarily related to decrease in Company's stock price | (118,813) | (154,248)
Derivative liability at October 31, 2021 | $ 2,376,565 | $ 2,495,378

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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