Idaho constitution
Article V
Section 6

The Supreme Court shall consist of five justices, a majority of whom shall be necessary to make a quorum or pronounce a decision. If a justice of the Supreme Court shall be disqualified from sitting in a cause before said court, or be unable to sit therein, by reason of illness or absence, the said court may call a district judge to sit in said court on the hearing of such cause. The justices of the Supreme Court shall be elected by the electors of the state at large. The terms of office of the justices of the Supreme Court, except as in this article otherwise provided, shall be six years. The justices of the Supreme Court shall, immediately after the first election under this constitution, be selected by lot, so that one shall hold his office for the term of two years, one for the term of four years, and one for the term of six years. The lots shall be drawn by the justices of the Supreme Court, who shall, for that purpose, assemble at the seat of government, and they shall cause the result thereof to be certified to by the secretary of state and filed in his office. The chief justice shall be selected from among the justices of the Supreme Court by a majority vote of the justices. His term of office shall be four years. When a vacancy in the office of chief justice occurs, a chief justice shall be selected for a full four year term. The chief justice shall be the executive head of the judicial system.