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Property and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 68,390,000 $ 61,518,000  
Less accumulated depreciation (31,657,385) (27,508,397) (23,518,164)
Property and equipment, net 36,733,118 34,009,872  
Depreciation 4,216,000 4,043,000 3,744,000
Land
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 3,827,000 3,827,000  
Building and improvements
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 21,297,000 19,815,000  
Leasehold improvements
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 286,000 222,000  
Machinery and equipment
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 32,266,000 27,701,000  
Office and computer equipment
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 10,663,000 9,887,000  
Motor vehicles
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 51,000 $ 66,000