Quarterly report pursuant to Section 13 or 15(d)

D. ACCOUNTS RECEIVABLE (Tables)

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D. ACCOUNTS RECEIVABLE (Tables)
3 Months Ended
Mar. 31, 2019
Receivables [Abstract]  
Accounts Receivable
    March 31,
2019
    December 31,
2018
 
Accounts receivable   $ 2,566,692     $ 1,146,832  
Allowance for doubtful accounts     (20,399 )     (65,542 )
Accounts receivable, net   $ 2,546,293     $ 1,081,291