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Warrants (Tables) | 12 Months Ended
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Apr. 30, 2020
Warrant [Member] |
Schedule of Fair Value Assumptions Used | The Company determined the fair value using the Black-Scholes option pricing model with the following assumptions for the period ended April 30, 2020 and 2019:
|  | April 30, 2020 |  |  | April 30, 2019 |
Dividend rate |  |  | 0.0 | % |  |  | 0.0 | %
Risk-free rate |  |  | 0.17% - 0.19 | % |  |  | 2.2% - 2.3 | %
Expected life (years) |  |  | 1.2 - 1.6 |  |  |  | 2.2 - 2.6 |
Expected volatility |  |  | 81.8% - 112.7 | % |  |  | 110.0% - 153.4 | %

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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + 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 (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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