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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Cash, Uninsured Amount | $ 8,595,241 |
Other Receivables, Gross, Current | 1,836,852 | $ 1,527,762
Property, Plant and Equipment, Net | $ 279,379 | 351,070
Threshold Period Past Due for Write-off of Trade Accounts Receivable | 90 days |
Inventory Valuation Reserves | $ 67,000 | 49,000
Depreciation, Depletion and Amortization | 105,299 | 101,216
Amortization of Intangible Assets | $ 23,873 | 61,689
Equity Method Investment, Ownership Percentage | 6.00% |
Research and Development Expense | $ 1,910,209 | 1,679,098
Deferred Tax Assets, Valuation Allowance | 3,175,000 | 2,459,000
Deferred Tax Assets, Gross | 3,175,000 | 2,459,000
Advertising Expense | 174 | 0
Operating Lease, Right-of-Use Asset | $ 1,711,510 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | 1,789,251 | 1,476,209
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 |
Distribution Rights [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 18 years |
Purchased Technology Rights [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Patents [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |
MEXICO |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Inventory, Gross | $ 613,000 | $ 665,000
Property, Plant and Equipment, Net | 31,000 | $ 39,000
Accounting Standards Update 2016-02 [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Operating Lease, Right-of-Use Asset | 1,942,999 |
Operating Lease, Liability | $ 1,980,970 |
Three Distributors [Member] | Revenue Benchmark [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage | 57.20% |
Three Distributors [Member] | Accounts Receivable [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage | 80.00% |
Two Distributors [Member] | Revenue Benchmark [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage |  | 46.30%
Two Distributors [Member] | Accounts Receivable [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage |  | 68.10%
One Distributors [Member] | Revenue Benchmark [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage | 25.70% | 36.30%
Distributors in Ecuador [Member] | Accounts Receivable [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage | 43.90% |
Supplier Concentration Risk [Member] | Cost of Goods and Service, Product and Service Benchmark [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Concentration Risk, Percentage | 59.30% | 23.80%
5% Convertible Preferred Stock [Member] | Common Stock [Member] |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in Shares) | 321,429 |

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