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Equity (Tables) | 12 Months Ended
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Mar. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Schedule of changes in stock options outstanding [Table Text Block] |
|  |  |  |  | Weighted average |
|  | Outstanding |  |  | exercise price |
Balance, March 31, 2019 |  | 20,216,952 |  | C$ | 0.61 |
Granted |  | 3,000,000 |  |  | 0.29 |
Forfeited |  | (853,846 | ) |  | 1.03 |
Exercised |  | (1,469,938 | ) |  | 0.30 |
Balance, March 31, 2020 |  | 20,893,168 |  | C$ | 0.57 |
Granted |  | 1,138,000 |  |  | 4.52 |
Forfeited |  | (1,000,000 | ) |  | 0.62 |
Exercised |  | (7,476,972 | ) |  | 0.63 |
Balance, March 31, 2021 |  | 13,554,196 |  | C$ | 0.87 |
Schedule of stock options outstanding and exercisable [Table Text Block] |
Outstanding | Exercisable | Exercise price | Expiry date
676,502 | 676,502 | C$ | 0.30 | September 14, 2022
10,000 | — |  | 3.14 | February 11, 2026
5,075,000 | 5,075,000 |  | 0.30 | September 14, 2027
1,122,194 | 1,122,194 |  | 2.00 | October 11, 2027
250,000 | 250,000 |  | 2.00 | March 26, 2028
2,000,000 | 2,000,000 |  | 0.62 | September 18, 2028
500,000 | 500,000 |  | 0.27 | December 21, 2028
2,812,500 | 1,406,250 |  | 0.29 | February 10, 2030
100,000 | 37,500 |  | 0.38 | May 29, 2030
8,000 | 8,000 |  | 2.16 | December 24, 2030
1,000,000 | — |  | 5.00 | February 23, 2031
13,554,196 | 11,075,446 |  |  |
Schedule of warrants outstanding and exercisable [Table Text Block] |
Outstanding |  | Exercisable | Exercise price | Expiry date
1,250,000 | * | 400,000 | C$ | 1.24 | May 22, 2023
5,000,000 |  | 5,000,000 | C$ | 3.00 | January 12, 2024
6,250,000 |  | 5,400,000 |  |  |
Schedule of weighted average assumptions for stock options [Table Text Block] |
| 2021 | 2020
Risk-free interest rate | 0.42% | 1.32%
Expected life (years) | 5.00 | 6.00
Annualized volatility | 105% | 120%
Dividend rate | 0.00% | 0.00%
Warrants [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Schedule of changes in other equity instruments outstanding [Table Text Block] |
|  | Warrants |  |  | Weighted average |
|  | outstanding |  |  | exercise price |
Balance, March 31, 2019 |  | 50,080,150 |  | C$ | 3.83 |
Expired |  | (48,830,150 | ) |  | 3.90 |
Balance, March 31, 2020 |  | 1,250,000 |  | C$ | 1.24 |
Issued |  | 5,000,000 |  |  | 3.00 |
Balance, March 31, 2021 |  | 6,250,000 |  | C$ | 2.65 |
Restricted share units [Member] |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |
Schedule of changes in other equity instruments outstanding [Table Text Block] |
|  | Outstanding |
Balance, March 31, 2019 |  | — |
Granted |  | 3,100,000 |
Balance, March 31, 2020 |  | 3,100,000 |
Granted |  | 310,000 |
Exercised |  | (1,626,000 | )
Balance, March 31, 2021 |  | 1,784,000 |

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