Annual report pursuant to Section 13 and 15(d)

D. ACCOUNTS RECEIVABLE (Tables)

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D. ACCOUNTS RECEIVABLE (Tables)
12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Accounts Receivable
    2016     2015  
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