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SHAREHOLDERS' EQUITY (Details) - USD ($) | 9 Months Ended
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Feb. 28, 2022 | Feb. 28, 2021
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |
Proceeds from Issuance of Common Stock | $ 2,317,160 | $ 1,011,475
Common Stock [Member] |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |
Sale of Stock, Number of Shares Issued in Transaction (in Shares) | 521,267 |
Sale of Stock, Consideration Received on Transaction | $ 2,402,000 |
Proceeds from Issuance of Common Stock | $ 2,317,000 |
Common Stock [Member] | Minimum [Member] |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |
Sale of Stock, Price Per Share (in Dollars per share) | $ 4.02 |
Common Stock [Member] | Maximum [Member] |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |
Sale of Stock, Price Per Share (in Dollars per share) | $ 5.63 |
Share-Based Payment Arrangement, Option [Member] |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |
Share-Based Payment Arrangement, Expense | $ 959,000 | $ 1,022,000

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