Uhm, other ppl have mentioned that clicking on the port shows you the amount of money you are making from imports. Which is a lot less than your main source of income: the exports.
Good provinces like Antioch, Tripoli, Flanders, Const, Egypt should turn in around 7-8k (more for Antioch and Tripoli) per turn in trade only (depends on how many provinces you're exporting into, and your governor's and king's acumen and virtues, of course).
You can see the money from trade as pointed above: click on the coin symbol on lower left corner, and then click on a province: it will show you all the money it makes from trading.
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