Here you can review some airfoil information:

http://www.ae.illinois.edu/m-selig/ads.html

Note in the format section, he descibes this:

""""""""""Some of the airfoils listed do not close at the trailing edge, i.e. the trailing edge has a finite thickness as designed""""""""

Looking at airfoil generators, you will find the option for the open end on the trailing edge...

I think the tiny number is a calculated exacting figure for the trailing adge, but not really used in anything... Like Michael had pointed out, "What will you do with THAT"...