Idaho Const. art. XVIII, § 8

The compensation provided in section seven for the officers therein mentioned shall be paid by fees or commissions, or both, as prescribed by law. All fees and commissions received by such officers in excess of the maximum compensation per annum provided for each in section seven of this article shall be paid to the county treasurer for the use and benefit of the county. In case the fees received in any one year by any one of such officers shall not amount to the minimum compensation per annum therein provided, he shall be paid by the county a sum sufficient to make his aggregate annual compensation equal to such minimum compensation.