Quarterly report pursuant to Section 13 or 15(d)

A. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)

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A. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($)
2 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
Feb. 16, 2021
Mar. 31, 2021
Mar. 31, 2020
Apr. 27, 2021
Dec. 31, 2020
Apr. 17, 2020
Dec. 31, 2019
Accumulated deficit   $ (128,172,652)     $ (128,255,391)    
Accounts payable   774,669     1,043,007    
Accrued royalties - long-term   465,000     500,000    
Net Cash Used In Operating Activities   (653,953) $ (109,888)        
Note Payable - current   0     913,063    
Proceeds from loan     $ 0        
Credit line amount outstanding   $ 587,814     $ 267,289    
Shares excluded from EPS calculation (antidilutive shares)   3,599,793 3,599,793        
Guarantees and product warranty return percentage   1% to 3%     1% to 3%    
Advertising expense   $ 1,493 $ 5,893        
Research and development expenses   311,448 369,243        
Stock based compensation expenses   1,815 1,815        
Warranty liabilities   23,757 $ 45,328   $ 45,328   $ 58,791
Credit Facility [Member]              
Credit line maximum borrowing capacity   2,000,000          
Credit line amount outstanding   $ 587,814          
Line of credit expiration date   Sep. 30, 2021          
PPP Loan [Member]              
Note Payable - current           $ 913,063  
Debt forgiven $ 913,063            
Interest forgiven $ 7,610            
PPP Loan [Member] | Subsequent Event [Member]              
Debt instrument, maturity date       Apr. 27, 2026      
Note Payable - current       $ 913,063      
License Agreement [Member]              
Accounts payable   $ 66,000          
Accrued royalties - long-term   $ 465,000