Idaho Code § 50-1021
All bonds authorized at any city election heretofore held, as provided in said section 50-1026 [, Idaho Code], or acts amendatory thereof, for the purpose of acquiring adequate plants for such city by purchase or otherwise, and by enlarging, extending[,] repairing, altering or improving any existing city water, light and power or sewage [sewerage] systems, shall be deemed to have been authorized for all or any of the purposes for which such bonds may hereafter be issued under this section, and all such bonds which at such election have been heretofore authorized, when issued and sold, are hereby declared to be legal and binding obligations of such city, provided all requirements of law have been fully complied with, and the same are hereby declared to be of like force and effect as if the city, at the time such election was called and held, had possessed all the power herein granted and conferred.
Idaho Code § 50-1021