Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY (Details) - Schedule of Stockholders' Equity Note, Warrants or Rights

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STOCKHOLDERS' EQUITY (Details) - Schedule of Stockholders' Equity Note, Warrants or Rights - $ / shares
12 Months Ended
May 31, 2020
May 31, 2022
May 31, 2021
Schedule Of Stockholders Equity Note Warrants Or Rights Abstract      
Warrants outstanding, Number of Shares 54,835,145 53,997,645  
Warrants outstanding, Weighted Average Exercise Price $ 0.53 $ 0.5 $ 0.53
Granted, Number of Shares   3,030,304 0
Granted, Weighted Average Exercise Price   $ 0.41 $ 1.1
Exercised, Number of Shares   0 0
Exercised, Weighted Average Exercise Price   $ 0 $ 0
Cancelled / Expired, Number of Shares   (50,576,610) (837,500)
Cancelled / Expired, Weighted Average Exercise Price   $ 0.52 $ 0.75
Warrants outstanding, Number of Shares   6,451,339 53,997,645