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SIGNIFICANT ACCOUNTING POLICIES (Details) - Options Activity - Share-based Payment Arrangement, Option [Member] - $ / shares | 6 Months Ended
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Nov. 30, 2021 | Nov. 29, 2021 | Nov. 30, 2020
SIGNIFICANT ACCOUNTING POLICIES (Details) - Options Activity [Line Items] |  |  |
Options Outstanding, Shares | shares | 2,081,366 | 2,081,366 |
Option Outstanding, Exercise Price Weighted Average | $ / shares | $ 3.59 | $ 3.59 |
Option Granted, Shares | shares |  | 24,000 | 24,000
Option Granted, Exercise Price Weighted Average | $ / shares |  | $ 4.25 | $ 4.25
Option Exercised, Shares | shares | (21,500) | (21,500) |
Option Exercised, Exercise Price Weighted Average | $ / shares |  | $ 1.64 |
Option Cancelled or expired, Shares | shares |  | (24,750) |
Option Cancelled or expired, Exercise Price Weighted Average | $ / shares |  | $ 3.24 |
Options Outstanding, Shares | shares | 2,059,116 |  |
Option Outstanding, Exercise Price Weighted Average | $ / shares | $ 3.62 |  |

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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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