They judged the people under normal circumstances; the difficult cases they would bring ¹  to Moses, but every small case they would judge themselves.

The Lord spoke to Moses, “Tell Aaron, ‘Extend your hand with your staff ¹  over the rivers, over the canals, and over the ponds, and bring the frogs up over the land of Egypt.’”

then his master must bring him to the judges, ¹  and he will bring him to the door or the doorposts, and his master will pierce his ear with an awl, and he shall serve him forever. ² 

and you are to kill the ram and take some of its blood and put it on the tip of the right ear of Aaron, on the tip of the right ear of his sons, on the thumb of their right hand, and on the big toe of their right foot, ¹  and then splash the blood all around on the altar.

Then the Lord said to Moses, “Tell Aaron, ‘Take your staff and stretch out your hand over Egypt’s waters – over their rivers, over their canals, ¹  over their ponds, and over all their reservoirs ²  – so that it becomes ³  blood.’ There will be blood everywhere in ⁴  the land of Egypt, even in wooden and stone containers.”