Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Components of accounts receivable    
Accounts receivable $ 1,016,946 $ 873,147
Allowance for doubtful accounts (9,388) (7,973)
Accounts receivable, net $ 1,007,558 $ 865,174