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Goodwill and intangible assets (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Intangible amortization expense    
2013 $ 727,326  
2014 636,097  
2015 634,664  
2016 634,375  
2017 298,784  
Thereafter 358,344  
Net book value $ 3,289,590 $ 799,648