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Accounts Receivable - Trade (Tables)
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Accounts Receivable

Accounts receivable consisted of the following at December 31, 2018 and 2017:

 

    2018     2017  
             
Accounts receivable – trade   $ 4,658,352     $ 3,846,724  
Allowance for doubtful accounts     (276,507 )     (200,874 )
Allowance for sales returns and volume rebates     (747,119 )     (555,918 )
                 
Accounts receivable - trade, net of allowances   $ 3,634,726     $ 3,089,932