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Income taxes - Components of income before income taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income taxes    
Foreign (not subject to income taxes) $ 13,593,497 $ 15,100,642
Mexico (2,458,210) (3,115,656)
United States 2,657,405 (153,003)
Income before income taxes 13,792,692 11,831,983
Less gain on sale of discontinued operations (3,621,170) 0
Less discontinued operations (3,621,170) (1,115,825)
Income before income taxes $ 10,171,522 $ 10,716,158