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2. ACCOUNTS RECEIVABLE (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable, after Allowance for Credit Loss [Abstract]    
Balance at beginning of period $ 3,977 $ 15,921
Charged to costs and expenses 4,618 0
Charged to other accounts 0 0
Write-offs, net of recoveries (1,497) (11,944)
Balance at end of period $ 7,098 $ 3,977