Idaho High School Hockey Teams Gear Up for Championship Season. The Idaho high school hockey scene is heating up as the state's top teams prepare to face off in the upcoming championships. With the Idaho State High School Hockey Association (ISHSHA) playoffs just around the corner, fans are eagerly anticipating the action on the ice. From the Treasure Valley to the Panhandle, teams have been battling it out all season long, vying for a spot in the coveted state championship title. Will this year's crop of talented players bring home the coveted gold, or will a new team emerge to claim the top prize?