Combine flour, soda, and spices in a bowl and set aside.
Cream sugar and margarine.
Beat in egg and molasses until light and fluffy.
Stir in flour mixture just until blended.
Chill for 2 hours or more.
Preheat oven to 375 degrees.
Shape dough into 3/4-inch balls, roll in granulated sugar, and place on lightly greased baking sheets about 2 inches apart. Flatten each ball with the bottom of a glass dipped in sugar. Bake about 8 to 10 minutes, until set. Makes 8 dozen cookies. (350 degrees, 18 minutes)