Combine flour, sugar, baking powder salt and baking soda. Cut in the butter until the mixture is crumbly.In a small bowl, combine the yogurt and eggs yolks. Add with the lemon juice to the crumb mixture.Stir in blueberries until just blended.Turn dough onto a floured surface, knead gently 8-10 times. Pat into a 9-inch circle. Cut into 4 4-inch circles. Place each circle on an ungreased baking sheet. Cut 4 wedges in each circle, but do not separate.Bake 425°, 15-18 minutes, or until the scones are golden brown.Cool on a wire rackOnce the scones are cool, prepare the glaze.Combine the confectioners' sugar, lemon juice, and lemon zest in a small bowl.Drizzle over the scones using a spoon.