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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%