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, 2019
May 31, 2021
May 31, 2020
Schedule of Stockholders' Equity Note, Warrants or Rights [Abstract]      
Warrants outstanding, Number of Shares 54,818,985 54,835,145  
Warrants outstanding, Weighted Average Exercise Price $ 0.53 $ 0.53 $ 0.53
Granted, Number of Shares   0 16,160
Granted, Weighted Average Exercise Price   $ 0 $ 1.10
Exercised, Number of Shares   0 0
Exercised, Weighted Average Exercise Price   $ 0 $ 0
Cancelled / Expired, Number of Shares   (837,500) 0
Cancelled / Expired, Weighted Average Exercise Price   $ 0.75 $ 0
Warrants outstanding, Number of Shares   53,997,645 54,835,145