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 ($)
3 Months Ended 4 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Apr. 21, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash $ 3,084,828     $ 3,300,600 $ 4,678,891
Accumulated deficit (125,758,040)     (125,105,539)  
Net Cash Used In Operating Activities $ (109,888) $ (1,716,357)      
Shares excluded from EPS calculation (antidilutive shares) 3,599,793 3,599,793      
Debt face amount $ 913,063        
Interest rate 1.00%        
Maturity date Apr. 21, 2022        
Guarantees and product warranty return percentage 1% to 3% 1% to 3%      
Advertising expense $ 5,893 $ 10,805      
Research and development expenses 369,243 486,626      
Stock based compensation expenses 1,815 $ 1,815      
Warranty liabilities $ 61,742     $ 58,791 $ 46,103
Debt maturity date Apr. 21, 2022        
Subsequent Event [Member] | PPP Loan [Member]          
Maturity date     Apr. 21, 2022    
Proceeds from bank loan     $ 913,063    
Debt stated interest rate     1.00%    
Debt maturity date     Apr. 21, 2022    
Credit Facility [Member]          
Line of credit remaining borrowing capacity $ 153,000        
Line of credit outstanding balance $ 518,463