Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Tables)

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D. ACCOUNTS RECEIVABLE (Tables)
6 Months Ended
Jun. 30, 2016
Receivables [Abstract]  
Accounts Receivable
    June 30,
2016
    December 31,
2015
 
Accounts receivable   $ 2,801,015     $ 2,286,690  
Allowance for doubtful accounts     (28,517 )     (23,343 )
Accounts receivable, net   $ 2,772,498     $ 2,263,347