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Intangible Assets (Details 1) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Estimated amortization expense of intangible assets    
2013 $ 149,498  
2014 148,582  
2015 139,831  
2016 132,760  
2017 129,187  
Thereafter 763,201  
Net Carrying Amount $ 1,463,059 $ 1,432,895