Idaho Code § 39-1351

Interest on any warrant shall cease on the expiration of thirty (30) days from the time of posting of the notice provided for in the last preceding section; and for all sums which may be paid by the treasurer, as interest on any warrant or warrants, after the expiration of thirty (30) days from the earliest date at which there were sufficient funds with which to have called and paid the same, such treasurer and his sureties shall be liable upon his official bond.