Idaho Code § 42-1746
The board may by resolution, from time to time, provide for the issuance of funding or refunding revenue bonds to fund or refund any outstanding revenue or other warrants or bonds, and any premiums thereon, and coupons evidencing interest upon any such bonds at or before the maturity or first optional redemption date of such coupons, warrants or bonds, and may combine various outstanding revenue warrants and parts or all of various series and issues of outstanding revenue bonds and matured coupons in the amount thereof to be funded or refunded. Revenue bonds may be refunded only at maturity, upon call for redemption in accordance with their terms or with consent of the holder.
The board shall create a special fund or funds for the sole purpose of paying the principal of and interest on such funding or refunding revenue bonds, into which fund the board shall obligate and bind the board to set aside and pay any part or parts of, or all of, or a fixed proportion of, or a fixed amount of the available revenue of the board sufficient to pay such principal and interest as the same shall become due, and if deemed necessary to maintain adequate reserves therefor.
Such funding or refunding bonds shall be negotiable instruments within the provisions and intent of the negotiable instrument laws of this state.
The board may exchange such funding or refunding bonds for the warrants, bonds, and coupons being funded or refunded, or it may sell such funding or refunding bonds in the manner and at such price as the board shall deem to be in the best interest of the state, either at public or private sale, or may both exchange and sell.
The provisions of this act relating to the terms, conditions, covenants, issuance, and sale of revenue bonds shall be applicable to such funding or refunding bonds except as may be otherwise specifically provided in this section.
Idaho Code § 42-1746