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INCOME TAXES (Details) - USD ($) | 12 Months Ended
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May 31, 2020 | May 31, 2019
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 | $ 3,175,000 | $ 2,459,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 716,000 | $ 900,000
Domestic Tax Authority [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Operating Loss Carryforwards | 9,213,000 |
California State Income Tax [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Operating Loss Carryforwards | 5,025,000 |
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Tax Credit Carryforward, Amount | 438,000 |
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member] |  |
INCOME TAXES (Details) [Line Items] |  |
Tax Credit Carryforward, Amount | $ 160,000 |

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