The state shall be divided into judicial circuits, each of which shall consist of not less than one county. Each county shall have at least one superior court, magistrate court, a probate court, and, where needed, a state court and a juvenile court. The General Assembly may provide by law that the judge of the probate court may also serve as the judge of the magistrate court. In the absence of a state court or a juvenile court, the superior court shall exercise that jurisdiction. Superior courts shall hold court at least twice each year in each county.