Inventories (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Schedule of inventory
Raw materials	$ 1,934,948	$ 5,658,519
Work-in-progress	29,291,626	25,862,185
Finished goods	51,782,742	55,664,077
Inventory gross	83,009,316	87,184,781
Less: allowance for obsolete inventories	(11,418,648)	(11,994,584)
Total inventories	$ 71,590,668	$ 75,190,197