In a medium bowl, combine flour, yeast, and salt. Stir in cold water and combine well. Cover the bowl tightly with plastic wrap. Allow dough to rest on the countertop for 12 to 18 hours. (It should double in size and move when you tilt the bowl). Sprinkle the dough with a little flour (about a 1/2 tbs.) Lightly stir until it forms a ball. Grease a 10 inch cast iron skillet with the olive oil. (Make sure you grease up the sides of the pan) Place the dough ball in the greased skillet, spreading close to the edge with oiled fingers. (It's okay if it doesn't spread completely to the edges). Cover the pan with a lid or plate and let rest for at least an hour. Preheat oven to highest temperature. (Mine happens to be 550* F) Add sauce, cheese, and toppings to the risen dough. Start cooking the pizza on a stove-top burner on medium high for 3 minutes. Place in preheated oven and bake about 12 minutes (if oven is at 550* F, if your oven temp. is lower cook an additional 2-4 minutes or until golden). Be careful when removing from the oven, the pizza will be extremely hot, Enjoy!