Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY (Details) - Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

v3.22.2.2
STOCKHOLDERS' EQUITY (Details) - Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range - $ / shares
 12 Months Ended
May 31, 2020
May 31, 2022
May 31, 2021
Jan. 04, 2022
Jul. 17, 2021
Mar. 31, 2021
May 30, 2020
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   $ 0.4125   $ 0.4125 $ 0.4 $ 1.1  
Number of warrants outstanding (in Shares)   6,451,339 53,997,645       54,835,145
Weighted average remaining contractual life   1 year 5 months 12 days          
Weighted average exercise price of outstanding warrants $ 0.53 $ 0.5 $ 0.53        
Number of warrants exercisable (in Shares)   6,451,339          
Weighted average exercise price of exercisable warrants   $ 0.5          
Warrants Exercisable at $0.40 to $0.41[Member]              
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Number of warrants outstanding (in Shares)   3,326,339          
Weighted average remaining contractual life   1 year 11 months 1 day          
Weighted average exercise price of outstanding warrants   $ 0.41          
Number of warrants exercisable (in Shares)   3,326,339          
Weighted average exercise price of exercisable warrants   $ 0.41          
Warrants Exercisable at $0.40 to $0.41[Member] | Minimum [Member]              
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   0.4          
Warrants Exercisable at $0.40 to $0.41[Member] | Maximum [Member]              
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   0.41          
Warrant Exercisable at $0.60 [Member]              
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   $ 0.6          
Number of warrants outstanding (in Shares)   3,125,000          
Weighted average remaining contractual life   11 months 12 days          
Weighted average exercise price of outstanding warrants   $ 0.6          
Number of warrants exercisable (in Shares)   3,125,000          
Weighted average exercise price of exercisable warrants   $ 0.6