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Goodwill and intangible assets (Details 3) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Intangible amortization expense    
2015 $ 616,552us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 607,929us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 285,893us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 77,290us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 72,439us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 386,597us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net book value $ 2,046,700us-gaap_FiniteLivedIntangibleAssetsNet $ 2,820,909us-gaap_FiniteLivedIntangibleAssetsNet