Idaho Code § 18-3302A

It shall be unlawful to directly or indirectly sell to any minor under the age of eighteen (18) years any weapon without the written consent of the parent or guardian of the minor. Any person violating the provisions of this section shall be guilty of a misdemeanor and shall be punished by a fine not in excess of one thousand dollars ($1,000), by imprisonment in the county jail for a term not in excess of six (6) months, or by both such fine and imprisonment. As used in this section, “weapon” shall mean any dirk, dirk knife, bowie knife, dagger, pistol, revolver or gun.