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Property and Equipment (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Components of property and equipment    
Property and equipment, gross $ 64,872,546 $ 62,611,158
Less: accumulated depreciation (31,531,203) (29,430,039)
Property and equipment, net $ 33,341,343 33,181,119
Office equipment and furniture [Member]    
Components of property and equipment    
Property and equipment, useful life 5 years  
Property and equipment, gross $ 90,272 71,120
Manufacturing equipment [Member]    
Components of property and equipment    
Property and equipment, gross $ 35,680,028 34,419,653
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 $ 259,906 253,564
Building and building improvements [Member]    
Components of property and equipment    
Property and equipment, gross $ 23,345,633 22,556,026
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  
Manufacturing equipment in progress [Member]    
Components of property and equipment    
Property and equipment, gross $ 3,785,348 3,657,936
Construction in progress [Member]    
Components of property and equipment    
Property and equipment, gross $ 1,711,359 $ 1,652,859