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SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity - $ / shares | 12 Months Ended
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May 31, 2021 | May 31, 2020
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
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 | 1,789,251 |
Options outstanding, weighted average exercise price | $ 2.75 |
Options outstanding, number of stock options |  | 1,789,251
Options outstanding, weighted average exercise price |  | $ 2.75
Exercise Price Range Per Share $5.14 - $8.70 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options granted, number of stock options | 430,616 |
Options granted, weighted average exercise price | $ 6.73 |
Exercise Price Range Per Share $0.82 - $3.62 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options exercised, number of stock options | (86,750) |
Options exercised, weighted average exercise price | $ 1.20 |
Exercise Price Range Per Share $2.35 - $8.18 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Outstanding Stock Options Activity [Line Items] |  |
Options canceled or expired, number of stock options | (51,751) |
Options canceled or expired, weighted average exercise price | $ 4.77 |
Exercise Price Range Per Share $0.82 - $8.70 [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 | 2,081,366 |
Options outstanding, weighted average exercise price | $ 3.59 |

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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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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