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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Text Block]
Accounts receivable, net, consists of the following at December 31:

 
 
2014
 
2013
Accounts receivable
 
$
6,103,038

 
$
5,833,888

Allowances for doubtful accounts
 
(59,188
)
 
(64,129
)
Accounts receivable, net
 
$
6,043,850

 
$
5,769,759