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INCOME TAXES (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jun. 01, 2018 | May 31, 2018 | May 31, 2017
INCOME TAXES (Details) [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, Percent |  | 21.00% |
Deferred Tax Assets, Valuation Allowance |  | $ 1,549,000 | $ 1,435,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 114,000 | 397,000
Operating Loss Carryforwards |  | 4,565,000 |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  | 46,602 | $ 40,205
California State Income Tax [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Operating Loss Carryforwards |  | 2,918,000 |
Domestic Tax Authority [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  | 323,000 |
State and Local Jurisdiction [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  | 62,000 |
Subsequent Event [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
Federal Ministry of Finance, Germany [Member] |  |  |
INCOME TAXES (Details) [Line Items] |  |  |
Operating Loss Carryforwards |  | 35,000 |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  | $ 10,000 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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