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Income and loss per share - Schedule of income (loss) per share (Details) - shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings per share [Abstract]    
Basic weighted average number of common shares outstanding 347,059,039 326,895,000
Effect of dilutive stock options and warrants 13,259,446 0
Effect of convertible loan 6,128,917 0
Diluted weighted average common shares outstanding 366,447,402 326,895,000