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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Gross accounts receivable $ 9,376,937 $ 4,346,810
Allowance for doubtful accounts (173,603) (276,234)
Total accounts receivable, net $ 9,203,334 $ 4,070,576