Cream together butter and sugar until light and fluffy, and beat in maple syrup, vanilla, and egg yolk until the mixture is combined well.
Sift together salt and flour over the mixture and fold in thoroughly.
Chill dough for about 15 minutes, then roll out on a floured surface and cut into shapes.
Bake at 350 degrees for about 10 minutes, but watch closely for browning on appendages, especially if you are working with a shape like Wisconsin! Allow to cool on racks.
For the Glaze:
Mix 2 tablespoons maple syrup with as much powdered sugar as it takes to make a nice, thick glaze. Drizzle over cookies and allow to set up before storing.