Quarterly report pursuant to Section 13 or 15(d)

C. ACCOUNTS RECEIVABLE (Details)

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C. ACCOUNTS RECEIVABLE (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Components of accounts receivable    
Accounts receivable $ 1,531,690 $ 1,438,345
Allowance for doubtful accounts (60,173) (34,573)
Accounts receivable, net $ 1,471,517 $ 1,403,772