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, 2018
Receivables [Abstract]  
Schedule of accounts receivable
    2018     2017  
Accounts receivable   $ 1,146,832     $ 1,632,459  
Allowance for doubtful accounts     (65,542 )     (22,173 )
Accounts receivable, net   $ 1,081,291     $ 1,610,286