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Equity (Tables)
 12 Months Ended
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