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INCOME TAXES (Details) - USD ($) | 12 Months Ended
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May 31, 2021 | May 31, 2020
INCOME TAXES (Details) [Line Items] |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00%
Deferred Tax Assets, Valuation Allowance | $ 5,590,000 | $ 3,488,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 2,102,000 | 1,029,000
Equity Option [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 313,000
Domestic Tax Authority [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Operating Loss Carryforwards | 12,957,000 |
California State Income Tax [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Operating Loss Carryforwards | 6,768,000 |
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Tax Credit Carryforward, Amount | 715,000 |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Tax Credit Carryforward, Amount | $ 341,000 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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