Through the years, I've found that the general rule mentioned in Andy Lennon's material is correct... That is, once the chord of an airfoil drops below 5 or 6 inches, you may as well have a flat plate, due to Reynolds numbers effects. (The exception might be highly cambered airfoils, and I have almost no experience with those, so far.)

The canard on the 1/5th scale Long EZ is simply a sheet of balsa... Airfoils made no difference in testing.

Good luck with your design project.