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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
12 Months Ended
May 31, 2017
May 31, 2016
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Cash, Uninsured Amount $ 700,000  
Property, Plant and Equipment, Net $ 331,857 $ 380,659
Threshold Period Past Due for Write-off of Trade Accounts Receivable 90 days  
Inventory Valuation Reserves $ 35,000 52,000
Depreciation, Depletion and Amortization 144,887 156,283
Amortization of Intangible Assets 74,332 76,139
Revenue Recognition, Sales Returns, Reserve for Sales Returns 0 0
Research and Development Expense 1,130,635 780,333
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 397,000 1,038,000
Deferred Tax Assets, Valuation Allowance 1,435,000 1,038,000
Advertising Expense $ 7,000 $ 2,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) 897,000 1,199,000
MX [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Inventory, Gross $ 467,000 $ 659,000
Property, Plant and Equipment, Net $ 15,000 $ 26,000
Minimum [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Property, Plant and Equipment, Useful Life 5 years  
Maximum [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Property, Plant and Equipment, Useful Life 10 years  
Maximum [Member] | Marketing-Related Intangible Assets [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Finite-Lived Intangible Asset, Useful Life 18 years  
Maximum [Member] | Patents [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Finite-Lived Intangible Asset, Useful Life 17 years  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Concentration Risk, Percentage 45.20% 30.30%
Cost of Goods, Product Line [Member] | Supplier Concentration Risk [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Concentration Risk, Percentage 23.00% 25.30%
Investment In Polish Distributor [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Equity Method Investment, Ownership Percentage 6.00%  
Two Customers [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Concentration Risk, Percentage 54.20% 60.30%
Domestic Customer [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Accounts Receivable Initial Credit Limit $ 500