Inventories (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Schedule of inventory
Raw materials	$ 2,273,209	$ 5,658,519
Work-in-progress	30,661,653	25,862,185
Finished goods	54,087,608	55,664,077
Inventory gross	87,022,470	87,184,781
Less: allowance for obsolete inventories	(10,403,366)	(11,994,584)
Total inventories	$ 76,619,104	$ 75,190,197