Prepayments (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Prepayments [Abstract]
Purchase deposits paid	$ 2,483,707	$ 1,120,911
Advance to staff	151,924	70,882
Other deposits and prepayments	1,196,717	1,261,523
Valued-added tax prepayment	801,375	770,479
Total prepayments	$ 4,633,723	$ 3,223,795