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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 29, 2021 | Nov. 30, 2020 | May 31, 2021 | Jan. 22, 2021
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) | $ (33,214,190) |  | $ (33,214,190) |  |  | $ (30,546,335) |
Shelf Registration Statement, Maximum Authorized Common Stock Issuance, Value |  |  |  |  |  |  | $ 15,000,000
Cash, Uninsured Amount | $ 6,950,000 |  | 6,950,000 |  |  |  |
Threshold Period Past Due for Write-off of Trade Accounts Receivable | 90 days |  |  |  |  |  |
Allowance for Credit Loss, Receivable, Other, Current | $ 28,000 |  | 28,000 |  |  |  |
Prepaid Expense and Other Assets | 1,097,000 |  | 1,097,000 |  |  | 370,000 |
Inventory Valuation Reserves | 1,799,000 |  | 1,799,000 |  |  | 1,617,000 |
Inventory, LIFO Reserve | 1,686,000 |  | 1,686,000 |  |  |  |
Depreciation, Depletion and Amortization | 26,000 | $ 26,000 | 54,000 |  | $ 53,000 |  |
Amortization of Intangible Assets | $ 7,000 | 6,000 | $ 14,000 |  | 12,000 |  |
Equity Method Investment, Ownership Percentage | 6.00% |  | 6.00% |  |  |  |
Proceeds from Stock Options Exercised |  |  | $ 34,480 |  | 49,330 |  |
Other Research and Development Expense | $ 619,000 | $ 617,000 | 1,058,000 |  | $ 1,328,000 |  |
Deferred Tax Assets, Valuation Allowance | $ 6,462,000 |  | $ 6,462,000 |  |  | $ 5,904,000 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | 2,059,116 | 1,399,763 |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares) |  |  | 21,500 | 21,500 |  |  |
Proceeds from Stock Options Exercised |  |  | $ 34,480 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  |  | 24,000 | 24,000 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  |  |  | $ 4.25 | $ 4.25 |  |
Distribution Rights [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 18 years |  |  |  |  |  |
Purchased Technology Rights [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |  |  |  |
Patents [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |  |  |  |  |
Minimum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price (in Dollars per share) | $ 1.2 |  | $ 1.2 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |  |  |  |
Maximum [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price (in Dollars per share) | $ 3.62 |  | $ 3.62 |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Distributors [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 66.00% |  | 35.00% |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Distributors [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Concentration Risk, Percentage | 73.00% |  |  |  |  | 73.00% |
Customer Concentration Risk [Member] | Accounts Payable [Member] | Two Vendors [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 47.00% |  |  |  |
Supplier Concentration Risk [Member] | Cost of Goods and Service, Product and Service Benchmark [Member] | Two Vendors [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 77.00% |  | 56.00% |  |
Supplier Concentration Risk [Member] | Accounts Payable [Member] | Two Vendors [Member] |  |  |  |  |  |  |
SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  | 17.00% |

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