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, 2015
Accounts Receivable Additional Disclosures [Abstract]  
Accounts Receivable
    June 30, 
2015
    December 31, 
2014
 
Accounts receivable   $ 2,147,706     $ 1,497,295  
Allowance for doubtful accounts     (30,217 )     (36,873 )
Accounts receivable, net   $ 2,117,489     $ 1,460,422