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Property And Equipment (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 31,186,417 $ 29,722,518 $ 30,638,602
Less accumulated depreciation 16,467,657 14,856,729 15,651,826
Total property and equipment 14,718,760 14,865,789 14,986,776
Depreciation expense 815,832 812,154  
Land [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 1,178,160 1,178,160 1,178,160
Building And Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 12,220,693 11,684,498 11,904,919
Machinery And Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 16,007,943 15,070,709 15,185,204
Vehicles [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 1,350,608 1,379,590 1,346,078
Office Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 429,013 409,561 411,773
Construction in Progress [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 0 $ 0 $ 612,468