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, 2018
Receivables [Abstract]  
Accounts Receivable
    June 30,
2018
    December 31,
2017
 
Accounts receivable   $ 1,996,969     $ 1,632,459  
Allowance for doubtful accounts     (13,542 )     (22,173 )
Accounts receivable, net   $ 1,983,427     $ 1,610,286