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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%