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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of Accounts Receivable

    2017     2016  
             
Accounts receivable   $ 2,145,803     $ 3,044,652  
Allowances for doubtful accounts     (40,332 )     (36,499 )
    $ 2,105,471     $ 3,008,153