Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Components of accounts receivable    
Accounts receivable $ 946,020 $ 2,338,626
Allowance for doubtful accounts (72,052) (55,039)
Accounts receivable, net $ 873,968 $ 2,283,587