Property, plant and equipment, net (Schedule of Plant and Equipment, Net) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Cost
Construction in progress	$ 687,287	$ 14,016,485
Furniture, fixtures and office equipment	3,010,510	2,734,321
Leasehold improvement	98,615	98,305
Machinery and equipment	15,203,124	13,429,090
Motor vehicles	1,305,719	1,225,948
Building	18,141,223	268,717
Property, plant and equipment, cost	38,446,478	31,772,866
Less: accumulated depreciation	7,491,032	6,310,210
Property, plant and equipment, net	$ 30,955,446	$ 25,462,656