Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Components of property and equipment
Property and equipment, gross	$ 53,610,710	$ 56,107,830
Less: accumulated depreciation	(23,732,035)	(21,472,874)
Property and equipment, net	$ 29,878,675	34,634,956
Office equipment and furniture [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Property and equipment, gross	$ 65,209	68,310
Manufacturing equipment [Member]
Components of property and equipment
Property and equipment, gross	$ 32,240,010	34,481,747
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	$ 169,773	181,651
Building and building improvements [Member]
Components of property and equipment
Property and equipment, gross	$ 21,135,718	$ 21,376,122
Building and building improvements [Member] | Minimum [Member]
Components of property and equipment
Property and equipment, useful life	5 years
Building and building improvements [Member] | Maximum [Member]
Components of property and equipment
Property and equipment, useful life	20 years