INCOME TAXES (Details) - USD ($)	12 Months Ended
	May 31, 2017	May 31, 2016
INCOME TAXES (Details) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Deferred Tax Assets, Valuation Allowance	$ 1,435,000	$ 1,038,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	397,000	1,038,000
Operating Loss Carryforwards	3,488,000
Windfall Tax Benefits	1,079,000
Tax Benefit To Be Adjusted To Additional Paid In Capital On Realization	378,000
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	40,205	$ 21,844
California State Income Tax [Member]
INCOME TAXES (Details) [Line Items]
Operating Loss Carryforwards	2,179,000
Domestic Tax Authority [Member]
INCOME TAXES (Details) [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	261,000
State and Local Jurisdiction [Member]
INCOME TAXES (Details) [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	46,000
German [Member]
INCOME TAXES (Details) [Line Items]
Operating Loss Carryforwards	88,000
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	$ 41,000