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Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2012
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Text Block]
Accounts receivable, net, consists of the following:

 
 
June 30,
2012
 
December 31,
2011
Accounts receivable
 
$
4,449,070

 
$
4,530,242

Allowances for doubtful accounts
 
(47,393
)
 
(48,125
)
Accounts receivable, net
 
$
4,401,677

 
$
4,482,117