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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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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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