Income Tax (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pre-tax income in jurisdictions
Pre tax income	$ 2,672,159	$ 2,472,845	$ 5,318,225	$ 5,763,862
PRC [Member]
Pre-tax income in jurisdictions
Pre tax income	1,582,335	712,029	3,350,278	3,691,090
Others [Member]
Pre-tax income in jurisdictions
Pre tax income	$ 1,089,824	$ 1,760,816	$ 1,967,947	$ 2,072,772