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SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity - $ / shares | 12 Months Ended
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May 31, 2020 | May 31, 2019
Exercise 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
Exercise Price Range Per Share $2.25 - $3.62 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options granted, number of stock options |  | 558,000
Options granted, weighted average exercise price |  | $ 2.60
Exercise Price Range Per Share $0.71 - $1.04 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options exercised, number of stock options |  | (163,500)
Options exercised, weighted average exercise price |  | $ 0.76
Exercise Price Range Per Share $0.71 - $3.62 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options canceled or expired, number of stock options |  | (56,916)
Options canceled or expired, weighted average exercise price |  | $ 2.49
Exercise Price Range Per Share $0.82 - $3.90 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options outstanding, number of stock options | 1,476,209 |
Options outstanding, weighted average exercise price | $ 2.07 |
Options exercised, number of stock options | (137,958) |
Options exercised, weighted average exercise price | $ 1.64 |
Options outstanding, number of stock options |  | 1,476,209
Options outstanding, weighted average exercise price |  | $ 2.07
Exercise Price Range Per Share $2.68 - $8.18 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options granted, number of stock options | 517,500 |
Options granted, weighted average exercise price | $ 4.47 |
Exercise Price Range Per Share $0.85 - $8.18 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options canceled or expired, number of stock options | (66,500) |
Options canceled or expired, weighted average exercise price | $ 3.43 |
Exercise Price Range Per Share $0.82 - $8.18 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options outstanding, number of stock options |  |
Options outstanding, weighted average exercise price |  |
Options outstanding, number of stock options | 1,789,251 |
Options outstanding, weighted average exercise price | $ 2.75 |

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- Definition 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. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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