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Accounts Receivable
3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Accounts Receivable

3. Accounts Receivable

 

    March 31, 2018     December 31, 2017  
Accounts receivable   $ 2,605,742     $ 2,145,803  
Allowances for doubtful accounts     (39,244 )     (40,332 )
    $ 2,566,498     $ 2,105,471