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Antidilutive securities excluded from computation of diluted net loss per share (Details) - shares | 12 Months Ended
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Apr. 30, 2022 | Apr. 30, 2021
Accounting Policies [Abstract] |  |
Series A Preferred Stock, as converted |  | 1,321,996
Series B Preferred Stock, as converted | 822,230 | 1,640,563
Stock Options | 3,694,142 | 2,197,475
Warrants | 1,539,999 | 873,332
Restricted stock | 1,083,675 | 687,500
Total | 7,140,046 | 6,720,866

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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