SHAREHOLDERS' EQUITY (Details) - Stock Options Summary	12 Months Ended
	May 31, 2022 $ / shares shares
Range Of Exercise Price $0.82 - $1.52 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	$ 0.82
Range of Exercise Price, Maximum	$ 1.52
Options Outstanding, Number (in Shares) | shares	456,000
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 3 months 29 days
Options Outstanding, Weighted Average Exercise Price	$ 1.04
Options Exercisable, Number (in Shares) | shares	456,000
Options Exercisable, Weighted Average Exercise Price	$ 1.04
Range Of Exercise Price $2.25 - $4.25 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	2.25
Range of Exercise Price, Maximum	$ 4.25
Options Outstanding, Number (in Shares) | shares	1,015,750
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 1 month 20 days
Options Outstanding, Weighted Average Exercise Price	$ 2.9
Options Exercisable, Number (in Shares) | shares	852,500
Options Exercisable, Weighted Average Exercise Price	$ 2.88
Range Of Exercise Price $4.34 - $8.70 [Member]
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of Exercise Price, Minimum	4.34
Range of Exercise Price, Maximum	$ 8.7
Options Outstanding, Number (in Shares) | shares	849,866
Options Outstanding, Weighted Average Remaining Contractual Life	8 years 9 months
Options Outstanding, Weighted Average Exercise Price	$ 6.13
Options Exercisable, Number (in Shares) | shares	266,654
Options Exercisable, Weighted Average Exercise Price	$ 7.06