Idaho constitution
Article V
Section 27

The legislature may by law diminish or increase the compensation of any or all of the following officers, to wit: governor, lieutenant governor, secretary of state, state controller, state treasurer, attorney general, superintendent of public instruction, justices of the Supreme Court, judges of the court of appeals and district courts and magistrate judges; but no diminution or increase shall affect the compensation of the officer then in office during his term, provided, however, that the legislature may provide for the payment of actual and necessary expenses of these officers incurred while in performance of official duty.