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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
May 31, 2022 | May 31, 2021 | Jan. 22, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Retained Earnings (Accumulated Deficit) | $ (35,077,379) | $ (30,546,335) |
Cash and Cash Equivalents, at Carrying Value | 5,916,983 | 4,199,311 |
Working Capital | 7,416,000 |  |
Shelf Registration Statement, Maximum Authorized Common Stock Issuance, Value |  |  | $ 15,000,000
Proceeds from Issuance of Common Stock | 2,401,734 | 1,177,394 |
Proceeds from Stock Options Exercised | 77,360 | 102,255 |
Cash, Uninsured Amount | 5,702,000 |  |
Revenues | 18,871,409 | 7,199,027 |
Other Receivables, Gross, Current | 927,000 |  |
Inventory, Gross | 3,262,000 | 4,823,000 |
Property, Plant and Equipment, Net | $ 214,487 | 310,520 |
Threshold Period Past Due for Write-off of Trade Accounts Receivable | 90 days |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ (684,184) | 766,434 |
Increase (Decrease) in Prepaid Supplies | 320,000 | 370,000 |
Inventory Valuation Reserves | 846,000 | 1,617,000 |
Depreciation, Depletion and Amortization | 100,000 | 105,000 |
Amortization of Intangible Assets | 239,000 | 34,000 |
Asset Impairment Charges | 210,000 | 0 |
Investments | 165,324 | 165,324 |
Share-Based Payment Arrangement, Expense | 1,260,000 | 1,355,000 |
Research and Development Expense | 1,812,424 | 2,194,461 |
Deferred Tax Assets, Valuation Allowance | 6,967,000 | 5,904,000 |
Deferred Tax Assets, Gross | 6,967,000 | 5,904,000 |
Advertising Expense | 76,000 | 10,000 |
Operating Lease, Right-of-Use Asset | 1,301,834 | $ 1,553,081 |
Operating Lease, Liability | $ 1,380,000 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | 2,321,616 | 2,081,366 |
Retained Earnings [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Retained Earnings (Accumulated Deficit) | $ 35,300,000 |  |
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 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | $ 1,943,000 |  |
Operating Lease, Liability | 1,981,000 |  |
Accounts Receivable [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 153,000 | $ 837,000 |
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 | $ 621,000 | 803,000 |
Property, Plant and Equipment, Net | $ 17,000 | $ 25,000 |
Polish Distributor [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 6.00% |  |
Investments | $ 165,000 |  |
Two Distributors [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 65.00% | 60.00% |
Two Distributors [Member] | Accounts Payable [Member] | Customer Concentration Risk [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage |  | 73.00% |
One Distributor [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 55.00% | 33.00% |
One Distributor [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Other Receivables, Gross, Current |  | $ 2,292,000 |
One Vendor [Member] | Accounts Payable [Member] | Customer Concentration Risk [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage |  | 17.00% |
One Vendor [Member] | Cost of Goods and Service, Product and Service Benchmark [Member] | Supplier Concentration Risk [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 84.00% | 58.00% |
ATM Agreement [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Stock Issued During Period, Shares, New Issues (in Shares) | 521,267 |  |
Proceeds from Issuance of Common Stock | $ 2,402,000 |  |
Proceeds from Stock Options Exercised | $ 2,317,000 |  |
ATM Agreement [Member] | Minimum [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Share Price (in Dollars per share) | $ 4.02 |  |
ATM Agreement [Member] | Maximum [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Share Price (in Dollars per share) | $ 5.63 |  |
One Distributor [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 50.00% |  |
Distributors in Asia [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 50.00% |  |

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