Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Components of accounts receivable    
Accounts receivable $ 2,523,149 $ 1,146,832
Allowance for doubtful accounts (67,894) (65,541)
Accounts receivable, net $ 2,455,255 $ 1,081,291