XML 92 R78.htm IDEA: XBRL DOCUMENT v3.19.1
Income taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Foreign (not subject to income taxes) $ 15,100,642 $ 10,041,971
Mexico (3,115,656) (3,188,134)
United States (153,003) (2,010,241)
Income before income taxes 11,831,983 4,843,596
Less discontinued operations (1,115,825) (1,041,234)
Income before income taxes $ 10,716,158 $ 3,802,362