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SHAREHOLDERS` EQUITY (Details) - Non-vested Stock Options Activity - $ / shares	12 Months Ended
	May 31, 2019	May 31, 2018
Non-vested Stock Options Activity [Abstract]
Nonvested shares at May 31, 2018	583,000
Nonvested shares at May 31, 2018	$ 2.34
Granted	558,000
Granted	$ 2.60	$ 3.63
Vested/Exercised	(331,500)
Vested/Exercised	$ 2.34
Forfeited	(39,916)
Forfeited	$ 3.08
Nonvested shares at May 31, 2019	769,584	583,000
Nonvested shares at May 31, 2019	$ 2.49	$ 2.34

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- References

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- Definition

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

+ References

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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- Definition

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

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- Definition

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

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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