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SHAREHOLDERS' EQUITY (Details) - USD ($) | 6 Months Ended
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Nov. 30, 2021 | Nov. 30, 2020
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |
Proceeds from Issuance of Common Stock | $ 1,684,123 |
Share-based Payment Arrangement, Option [Member] |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |
Share-based Payment Arrangement, Expense | $ 634,000 | $ 500,000
Common Stock [Member] |  |
SHAREHOLDERS' EQUITY (Details) [Line Items] |  |
Sale of Stock, Number of Shares Issued in Transaction (in Shares) | 363,670 |
Sale of Stock, Consideration Received on Transaction | $ 1,751,000 |
Proceeds from Issuance of Common Stock | $ 1,684,000 |
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 |

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