Property, plant and equipment, net (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Property, plant and equipment, net [Abstract]
Depreciation expenses	$ 633,433	$ 437,170	$ 1,565,147	$ 1,262,178
Capitalized interest recognized in construction in progress	$ 1,038,284		$ 1,038,284		$ 492,716