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SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity - $ / shares	12 Months Ended
	May 31, 2018	May 31, 2017
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options granted, number of stock options	287,000
Options exercised, number of stock options	(34,750)	(341,500)
Price Range Per Share $0.43 - $1.20 [Member]
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options outstanding, number of stock options		1,199,000
Options outstanding, weighted average exercise price		$ 0.81
Price Range Per Share $1.52 - $1.61 [Member]
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options granted, number of stock options		55,000
Options granted, weighted average exercise price		$ 1.55
Price Range Per Share $0.43 - $1.04 [Member]
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options exercised, number of stock options		(341,500)
Options exercised, weighted average exercise price		$ 0.46
Options canceled or expired, number of stock options		(15,500)
Options canceled or expired, weighted average exercise price		$ 0.90
Price Range Per Share $0.71 - $1.61 [Member]
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options outstanding, number of stock options	897,000
Options outstanding, weighted average exercise price	$ 0.98
Options outstanding, number of stock options		897,000
Options outstanding, weighted average exercise price		$ 0.98
Price Range Per Share $2.41 - $3.90 [Member]
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options granted, number of stock options	287,000
Options granted, weighted average exercise price	$ 3.63
Price Range Per Share $0.71 - $1.04 [Member]
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options exercised, number of stock options	(34,750)
Options exercised, weighted average exercise price	$ 0.80
Price Range Per Share $0.71 - $2.41 [Member]
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options canceled or expired, number of stock options	(10,625)
Options canceled or expired, weighted average exercise price	$ 1.44
Price Range Per Share $0.71 - $3.90 [Member]
SHAREHOLDERS` EQUITY (Details) - Outstanding Stock Options Activity [Line Items]
Options outstanding, number of stock options	1,138,625
Options outstanding, weighted average exercise price	$ 1.65

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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