Preheat oven to 400°. Place pine nuts and 1/4 cup flour in a food processor. Pulse until pine nuts are finely chopped. In a large bowl, cream butter, 1/2 cup confectioners' sugar and salt until light and fluffy. Beat in amaretto. Gradually beat in remaining flour and pine nut mixture.
Shape dough into 1-in. balls; place 2 in. apart on ungreased baking sheets. Bake 6-8 minutes or until set. Cool on pans 2 minutes.
Roll warm cookies in remaining confectioners' sugar. Cool on wire racks. When cooled, reroll cookies in confectioners' sugar. Freeze option: Freeze undecorated cookies, layered between waxed paper, in freezer containers. To use, thaw before serving. Roll cookies in confectioners' sugar.
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