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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 12 Months Ended
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May 31, 2018 | May 31, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Cash, Uninsured Amount | $ 632,000 |
Property, Plant and Equipment, Net | $ 351,149 | $ 331,857
Threshold Period Past Due for Write-off of Trade Accounts Receivable | 90 days |
Inventory Valuation Reserves | $ 52,000 | 35,000
Depreciation, Depletion and Amortization | 111,055 | 144,887
Amortization of Intangible Assets | 75,546 | 74,332
Revenue Recognition, Sales Returns, Reserve for Sales Returns | 0 | 0
Research and Development Expense | 1,398,368 | 1,130,635
Deferred Tax Assets, Valuation Allowance | 1,549,000 | 1,435,000
Advertising Expense | 1,000 | 7,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | $ 10,302 | $ 2,248
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | 1,138,625 | 897,000
MEXICO |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Inventory, Gross | $ 657,000 | $ 467,000
Property, Plant and Equipment, Net | $ 41,000 | $ 15,000
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 |
Marketing-Related Intangible Assets [Member] | Maximum [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 18 years |
Purchased Technology Rights [Member] | Maximum [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Patents [Member] | Maximum [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 17 years |
Domestic Customer [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Accounts Receivable Initial Credit Limit | $ 500 |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage | 43.30% | 45.20%
Credit Concentration Risk [Member] | One Customer [Member] | Accounts Receivable [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage | 53.30% |
Credit Concentration Risk [Member] | Two Customers [Member] | Accounts Receivable [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage |  | 54.20%
Supplier Concentration Risk [Member] | Cost of Goods, Product Line [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage | 27.70% | 23.00%
Investment In Polish Distributor [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Equity Method Investment, Ownership Percentage | 6.00% |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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