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SHAREHOLDERS' EQUITY (Details) - Activity as to aggregate stock options outstanding - $ / shares | 12 Months Ended
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May 31, 2022 | May 31, 2021
Exercise Price Range Per Share $0.82 - $8.18 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Activity as to aggregate stock options outstanding [Line Items] |  |
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) - Activity as to aggregate stock options outstanding [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) - Activity as to aggregate stock options outstanding [Line Items] |  |
Options exercised, number of stock options |  | (86,750)
Options exercised, weighted average exercise price |  | $ 1.2
Exercise Price Range Per Share $2.35 - $8.18 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Activity as to aggregate stock options outstanding [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) - Activity as to aggregate stock options outstanding [Line Items] |  |
Options outstanding, number of stock options | 2,081,366 |
Options outstanding, weighted average exercise price | $ 3.59 |
Options outstanding, number of stock options | 2,321,616 | 2,081,366
Options outstanding, weighted average exercise price | $ 3.72 | $ 3.59
Exercise Price Range Per Share $4.25 - $4.46 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Activity as to aggregate stock options outstanding [Line Items] |  |
Options granted, number of stock options | 344,000 |
Options granted, weighted average exercise price | $ 4.43 |
Exercise Price Range Per Share $1.20 - $3.62 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Activity as to aggregate stock options outstanding [Line Items] |  |
Options exercised, number of stock options | (39,500) |
Options exercised, weighted average exercise price | $ 1.99 |
Exercise Price Range Per Share $1.61 - $8.18 [Member] |  |
SHAREHOLDERS' EQUITY (Details) - Activity as to aggregate stock options outstanding [Line Items] |  |
Options canceled or expired, number of stock options | (64,250) |
Options canceled or expired, weighted average exercise price | $ 4.41 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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