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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Text Block]
Accounts receivable, net, consists of the following at December 31:

 
 
2015
 
2014
Accounts receivable
 
$
6,211,077

 
$
6,103,038

Allowances for doubtful accounts
 
(49,659
)
 
(59,188
)
Accounts receivable, net
 
$
6,161,418

 
$
6,043,850



The company maintains allowances for doubtful accounts for estimated losses resulting from the inability of its customers to make required payments.  The allowances for doubtful accounts are determined using a combination of factors, including the length of time the receivables are outstanding, the current business environment, and historical experience.