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Goodwill and intangible assets (Details 2) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Intangible amortization expense    
2014 $ 677,007  
2015 675,774  
2016 675,378  
2017 309,773  
2018 70,912  
Thereafter 412,065  
Net book value $ 2,820,909 $ 3,289,590