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, 2017
Receivables [Abstract]  
Schedule of accounts receivable

Components of accounts receivable as of December 31, 2017 and 2016 are as follows:

  

    2017     2016  
Accounts receivable   $ 1,632,459     $ 1,438,345  
Allowance for doubtful accounts     (22,173 )     (34,573 )
Accounts receivable, net   $ 1,610,286     $ 1,403,772