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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2011
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Text Block]
Accounts receivable, net, consists of the following at December 31:

 
 
2011
 
2010
Accounts receivable
 
$
4,530,242

 
$
4,140,868

Allowances for doubtful accounts
 
(48,125
)
 
(37,998
)
Accounts receivable, net
 
$
4,482,117

 
$
4,102,870