Idaho Code § 21-211
All moneys collected for the licensing of aircraft and airmen, all fines and penalties paid under the provisions of laws relating to or regulating the operation, registration or licensing of aircraft or pilots, air safety or air flight not otherwise appropriated and such other funds as may be paid into the state aeronautics fund shall be paid to the state treasurer, and shall be placed by him in the state aeronautics fund, which is hereby created, and all of said state aeronautics fund is hereby appropriated for the purpose of furthering the administration, development and enforcement of laws relating to aviation, for defraying state air flight program costs, and for defraying administrative expenses of the Idaho transportation department, including per diem compensation of the Idaho transportation board, and the salary of the director of the department. Interest earned on the investment of idle moneys in the state aeronautics fund shall be paid to the state aeronautics fund.
Idaho Code § 21-211