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SHAREHOLDERS' EQUITY (Details) - USD ($)	9 Months Ended
	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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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

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Cash received on stock transaction after deduction of issuance costs.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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