Easy Sausage Gravy

1/2 pound sausage
1/2 cup all-purpose flour
2 cups milk
In a medium or large skillet brown and crumble the sausage
without draining grease mix in the flour and stir until well coated and mixed
on medium heat, continue stirring until thickens 3-5 minutes approx.
Will also thicken as it cools, for thinner gravy use 2 1/2 cups milk instead.