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Concentration of Major Customers and Suppliers (Details)
3 Months Ended
Mar. 31, 2013
Supplier
Customer
Mar. 31, 2012
Supplier
Customer
Concentration and major customers and suppliers (Textual)    
Number of major suppliers 2 2
Number of customer contributed over 10% of total sales 0 0
Supplier A [Member]
   
Concentration and major customers and suppliers (Textual)    
Percentage of total purchase from major suppliers 76.00% 75.00%
Supplier B [Member]
   
Concentration and major customers and suppliers (Textual)    
Percentage of total purchase from major suppliers 10.00% 15.00%