Inventories (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Schedule of inventory
Raw materials	$ 13,212,328	$ 5,687,612
Work-in-progress	14,125,834	7,296,733
Finished goods	32,836,826	36,770,852
Inventory gross	60,174,988	49,755,197
Less: allowance for obsolete inventories	(3,477,690)	(3,716,741)
Total inventories	$ 56,697,298	$ 46,038,456