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Income taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Foreign (not subject to income taxes) $ 8,851,332 $ 10,502,379 $ 10,355,689
Mexico (3,339,932) (2,576,885) (3,591,149)
United States (3,270,144) 0 0
income (loss) before income taxes $ 2,241,256 $ 7,925,494 $ 6,764,540