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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
May 31, 2021 | May 31, 2020 | Jan. 22, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Retained Earnings (Accumulated Deficit) | $ (28,394,768) | $ (21,925,732) |
Shelf Registration Statement, Maximum Authorized Common Stock Issuance, Value |  |  | $ 15,000,000
Stock Issued During Period, Shares, New Issues (in Shares) | 158,889 |  |
Proceeds from Issuance of Common Stock | $ 1,011,475 | 10,232,857 |
Proceeds from Stock Options Exercised | 102,255 | 223,534 |
Cash, Uninsured Amount | $ 3,767,000 |  |
Concentration Risk, Percentage | 100.00% |  |
Other Receivables, Gross, Current | $ 2,292,466 | 1,836,852 |
Property, Plant and Equipment, Net | $ 310,520 | 279,379 |
Threshold Period Past Due for Write-off of Trade Accounts Receivable | 90 days |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 766,434 | (2,129) |
Increase (Decrease) in Prepaid Supplies | 370,000 | 1,000,000 |
Inventory Valuation Reserves | 1,617,000 | 67,000 |
Inventory, LIFO Reserve | 1,502,675 |  |
Depreciation, Depletion and Amortization | 104,715 | 105,299 |
Amortization of Intangible Assets | $ 33,552 | 23,873 |
Equity Method Investment, Ownership Percentage | 6.00% |  |
Research and Development Expense | $ 2,410,506 | 1,910,209 |
Deferred Tax Assets, Valuation Allowance | 5,590,000 | 3,488,000 |
Deferred Tax Assets, Gross | 5,590,000 | 3,488,000 |
Advertising Expense | 10,070 | 174 |
Operating Lease, Right-of-Use Asset | 1,553,081 | $ 1,711,510 |
Operating Lease, Liability | $ 1,619,514 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | 2,081,366 | 1,789,251 |
ATM Agreement [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Proceeds from Issuance of Common Stock | $ 1,177,394 |  |
Proceeds from Stock Options Exercised | $ 1,011,475 |  |
Series A Preferred Stock [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in Shares) | 321,429 |  |
Accounts Receivable [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 837,415 |  |
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 |  |
Minimum [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Share Price (in Dollars per share) | $ 7.06 |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Maximum [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Share Price (in Dollars per share) | $ 7.79 |  |
Property, Plant and Equipment, Useful Life | 10 years |  |
Retained Earnings [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Retained Earnings (Accumulated Deficit) | $ 28,400,000 |  |
5% Convertible Preferred Stock [Member] | Series A Preferred Stock [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Preferred Stock, Shares Outstanding (in Shares) | 0 | 321,429 |
MEXICO |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Inventory, Gross | $ 803,000 | $ 613,000 |
Property, Plant and Equipment, Net | $ 25,000 | $ 31,000 |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Distributors [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 60.00% |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Distributors [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage |  | 57.00% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Distributors [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 33.00% | 26.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Distributors [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 73.00% |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Distributors [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage |  | 80.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Distributors in China [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 41.00% |  |
Supplier Concentration Risk [Member] | Cost of Goods and Service, Product and Service Benchmark [Member] | One Vendor [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 58.00% | 59.00% |
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 |  |

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