Idaho Code § 50-215
In all prosecutions of any corporation for a violation of any city ordinance or any forfeiture or penalty provided by ordinance of such city, it shall be sufficient to make the corporation in its corporate name a defendant and service may be procured by serving of summons upon the president, secretary, or other managing agent of such corporation; and after the return of such service, the court shall be deemed to have acquired jurisdiction of the defendant and may proceed to try said cause; and any judgment imposed by said court shall have the force and effect of a judgment in a civil suit action and execution may issue thereon, and the corporate property, rights and franchises of said defendant may be sold thereunder in satisfaction of the same. The summons herein authorized to be served upon a defendant corporation shall contain a statement that the corporation shall appear forthwith and defend said action, and in case of failure to so appear and defend, a plea of not guilty will be entered by the court and the trial will proceed as if said defendant shall have appeared. A copy of the complaint shall be attached to and served with said summons.
Idaho Code § 50-215