Annual report pursuant to Section 13 and 15(d)

D. ACCOUNTS RECEIVABLE (Details)

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D. ACCOUNTS RECEIVABLE (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Components of accounts receivable    
Accounts receivable $ 1,438,345 $ 1,961,368
Allowance for doubtful accounts (34,573) (13,299)
Accounts receivable, net $ 1,403,772 $ 1,948,069