Annual report pursuant to Section 13 and 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 ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash $ 3,300,600 $ 4,678,891 $ 9,195,595
Accumulated deficit (125,105,539) (123,171,406) (119,724,656)
Net Cash Used In Operating Activities (1,875,846) (3,945,742)  
Allowance for doubtful accounts 55,039 65,542 22,173
Inventory impairment charge $ 241,000 114,000  
Property and equipment useful lives 2 to 10 years    
Impairment on long-lived assets $ 0 $ 0  
Shares excluded from EPS calculation (antidilutive shares) 3,599,793 3,599,793  
Tax Cut and Jobs Act impact $ 45,656 $ 0  
Change in valuation allowance for deferred tax assets 269,203 658,650  
Provision for Income Taxes $ (100,363) $ 9,623  
Guarantees and product warranty return percentage 1% to 3% 1% to 3%  
Advertising expense $ 54,945 $ 108,632  
Research and development expenses 1,737,385 1,879,676  
Stock based compensation expenses 7,262 6,404  
Warranty liabilities 58,791 $ 46,103 $ 59,892
Credit Facility [Member]      
Line of credit remaining borrowing capacity $ 424,000