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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
12 Months Ended
May 31, 2016
May 31, 2015
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Property, Plant and Equipment, Net $ 380,659 $ 445,386
Threshold Period Past Due for Write-off of Trade Accounts Receivable 90 days  
Inventory Valuation Reserves $ 52,000 25,000
Depreciation, Depletion and Amortization 156,283 178,219
Amortization of Intangible Assets 76,139 75,056
Revenue Recognition, Sales Returns, Reserve for Sales Returns 0 0
Research and Development Expense 780,333 733,640
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 1,038,000 0
Advertising Expense $ 2,000 $ 6,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) 1,199,000 1,148,000
Domestic Customer [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Accounts Receivable Initial Credit Limit $ 500  
MX [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Inventory, Gross 659,000 $ 530,000
Property, Plant and Equipment, Net $ 26,000 $ 35,000
Investment In Polish Distributor [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Equity Method Investment, Ownership Percentage 6.00%  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Concentration Risk, Percentage 30.30% 16.30%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Concentration Risk, Percentage 60.30% 53.00%
Cost of Goods, Product Line [Member] | Supplier Concentration Risk [Member]    
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]    
Concentration Risk, Percentage 25.30% 13.60%
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