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Summary of Significant Accounting Policies - Summary of Warrants Granted Valuation using Black-Scholes Pricing Method (Tables) | 12 Months Ended
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Apr. 30, 2020
Accounting Policies [Abstract] |
Summary of Warrants Granted Valuation using Black-Scholes Pricing Method | The warrants granted during the year ended April 30, 2020 and 2019 were valued using the Black-Scholes pricing method on the date of grant using the following assumptions below.
|  | 2020 |  | 2019
Expected life in years |  | 2 - 5 years |  | NA
Stock price volatility |  | 121.4% - 144.2% |  | NA
Risk free interest rate |  | 0.36% - 2.43% |  | NA
Expected dividends |  | 0% |  | NA

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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