Cream the sugar and margarine at medium speed of a mixer until light and fluffy (about 3 minutes). Add orange juice concentrate and egg; beat well. Combine flour, baking soda, orange rind, and salt; stir well. Gradually add to creamed mixture, beating well.
Drop dough by level tablespoons onto baking sheets coated with cooking spray. Bake at 350° for 12 minutes or until lightly browned; let cool on pans 1 minute. Remove from pans; let cool completely on wire racks.
Combine the powdered sugar and 1 tablespoon orange juice; stir well, and drizzle over cooled cookies.