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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Bad debt expense $ (27,000) $ 64,000 $ 32,000 $ 64,000  
Allowance for doubtful accounts 125,000   125,000   $ 300,000
Inventory reserve 100,000   100,000   100,000
Operating Lease Right of Use Asset 693,564   693,564   0
Lease liability 678,556   678,556    
Warranty reserve $ 30,000   $ 30,000   $ 30,000
Potentially dilutive securities, convertible debentures 9,259,250 9,814,805 9,259,250 9,814,805  
Potentially dilutive securities, outstanding warrants 26,850,611 35,076,411 26,850,611 35,076,411  
Potentially dilutive securities, outstanding options 620,000 320,000 620,000 320,000  
Potentially dilutive securities, convertible Series A preferred stock 510,000 510,000 510,000 510,000  
Advertising and promotional expenses $ 25,000 $ 58,000 $ 65,000 $ 112,000  
Research and development expenses 68,659 109,823 161,236 242,310  
Shipping and handling costs $ 40,000 $ 40,000 $ 79,000 $ 92,000  
Two Customers [Member] | Accounts Receivable [Member]          
Concentration risk, percentage         37.00%
Two Customers [Member] | Revenue, Net [Member]          
Concentration risk, percentage   26.00% 29.00%    
One Customer [Member] | Revenue, Net [Member]          
Concentration risk, percentage 26.00%     12.00%  
One Vendor [Member] | Accounts Payable [Member]          
Concentration risk, percentage     45.00%    
One Vendor [Member] | Cost of Sales [Member]          
Concentration risk, percentage 79.00% 75.00% 74.00% 73.00%  
Three Vendors [Member] | Accounts Payable [Member]          
Concentration risk, percentage         63.00%