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Intangible assets (Details 1) (USD $)
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]  
2015 $ 156,089us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 156,089us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 81,955us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 66,192us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 66,192us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 401,383us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Finite Lived Intangible Assets Net $ 927,900us-gaap_FiniteLivedIntangibleAssetsNet