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Intangible assets (Details 1)
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2017 $ 1,430,042
2018 1,406,192
2019 795,081
2020 281,192
2021 166,192
Thereafter 1,116,777
Finite Lived Intangible Assets Net $ 5,195,476