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SHAREHOLDERS' EQUITY (Details) - Non-vested Stock Options Activity	12 Months Ended
	May 31, 2022 $ / shares shares
Non Vested Stock Options Activity Abstract
Non-vested shares, number of shares | shares	793,241
Non-vested shares, weighted average grant date fair value | $ / shares	$ 5.54
Granted, number of shares | shares	344,000
Granted, weighted average grant date fair value | $ / shares	$ 4.43
Vested, number of shares | shares	(347,279)
Vested, weighted average grant date fair value | $ / shares	$ 5.4
Forfeited, number of shares | shares	(43,500)
Forfeited, weighted average grant date fair value | $ / shares	$ 5.22
Non-vested shares, number of shares | shares	746,462
Non-vested shares, weighted average grant date fair value | $ / shares	$ 5.11

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- Definition

Gross number of share options (or share units) granted during the period.

+ 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 (c)(1)(iv)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Weighted average grant-date fair value of non-vested options forfeited.

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