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Concentrations (Details) (Accounts Receivable [Member], Customer Concentration Risk [Member])
6 Months Ended
Jun. 30, 2013
Customer
Jun. 30, 2012
Customer
Accounts Receivable [Member] | Customer Concentration Risk [Member]
   
Concentrations (Textual)    
Number of major customers accounted for accounts receivable 2 2
Concentration risk, percentage 71.00% 37.00%