Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Components of accounts receivable    
Accounts receivable $ 1,335,581 $ 1,632,459
Allowance for doubtful accounts (112,542) (22,173)
Accounts receivable, net $ 1,223,039 $ 1,610,286