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2. ACCOUNTS RECEIVABLE (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, after Allowance for Credit Loss [Abstract]    
Allowance for doubtful accounts, beginning $ 10,000 $ 10,000
Charged to costs and expenses 0 0
Write-offs, net of recoveries 0 0
Allowance for doubtful accounts, ending $ 10,000 $ 10,000