Idaho Code § 42-2957
It shall be the duty of the treasurer of any county in which there may be a district issuing bonds under the provisions of this chapter whenever he has upon hand $5000 of the special fund for the payment of said bonds, and when said bonds shall have run for a period of three (3) years, to advertise in the newspaper doing the county printing, for the presentation to him for payment of as many of the bonds issued under the provisions of this chapter as he is able to pay with the funds in his hands, to be paid in numerical order of said bonds, beginning with the bond number one (1), until all of said bonds are paid: provided, that thirty (30) days after the first publication of said notice of the treasurer calling in any of said bonds, said bonds shall cease to bear interest.
Idaho Code § 42-2957