Property and Equipment (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Components of property and equipment
Property and equipment, gross	$ 82,467,709	$ 78,641,731
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(17,798,960)	(14,599,652)
Property and equipment, net	64,668,749	64,042,079
Office equipment and furniture [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Property and equipment, gross	217,350	215,145
Manufacturing equipment [Member]
Components of property and equipment
Property and equipment, gross	61,354,490	57,347,726
Manufacturing equipment [Member] | Minimum [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Manufacturing equipment [Member] | Maximum [Member]
Components of property and equipment
Property and equipment, useful life	10 years
Vehicles [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Property and equipment, gross	125,095	124,211
Construction in Progress [Member]
Components of property and equipment
Property and equipment, useful life	0 years
Property and equipment, gross		330,730
Building and building improvements [Member]
Components of property and equipment
Property and equipment, useful life	20 years
Property and equipment, gross	$ 20,770,774	$ 20,623,919