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Shareholders' Equity (Details Narrative) - USD ($) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2019 | Apr. 30, 2019 | Feb. 28, 2019 | Apr. 30, 2018 | Apr. 30, 2017 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2017 | May 31, 2016 | Apr. 30, 2016 | May 31, 2015 | Apr. 30, 2015
Convertible promissory notes |  |  |  |  |  |  |  | $ 181,500 |  |  |  |  |
Warrants issued |  |  |  |  |  |  |  |  | 25,000 |  |  |  |
Warrant exercise price |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |
Number of warrants exercised |  |  | 16,666 |  |  |  |  |  |  |  |  |  |
Number of warrants exercised, value |  |  | $ 166 |  |  |  |  |  |  |  |  |  |
Number of options, granted | 505,000 | 505,000 |  | 560,400 | 253,846 | 505,000 | 560,400 | 263,846 |  |  |  |  |
Exercise price of options granted |  |  |  |  |  | $ 0.43 | $ 0.50 | $ 0.64 |  |  |  |  |
Option term | 10 years | 10 years |  |  |  | 6 years 11 months 23 days | 6 years 11 months 15 days | 3 years 4 months 17 days |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of options granted | $ 0.41 | $ 0.41 |  |  |  |  |  |  |  |  |  |  |
Option vested period | 4 years | 4 years |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of options granted | $ 0.44 | $ 0.44 |  |  |  |  |  |  |  |  |  |  |
Option vested period | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued |  |  | 16,666 |  |  |  |  |  |  |  |  |  |
Warrant exercise price |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |
Convertible Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory notes |  |  | $ 181,500 |  | $ 165,000 |  |  |  |  | $ 200,000 | $ 200,000 | $ 200,000 | $ 200,000
Conversion price per share |  |  | $ 0.50 |  | $ 0.85 |  |  |  |  |  |  | $ 1.50 | $ 1.50
Principal and accrued interest |  |  | $ 211,983 |  |  |  |  |  |  |  |  |  |
Debt instrument conversion shares |  |  | 423,966 |  |  |  |  |  |  |  |  |  |
Warrant exercise price |  |  |  |  | $ 0.65 |  |  |  |  | $ 1.50 | $ 1.50 | $ 1.50 | $ 1.50

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