Quinton Upshur finished with 14 points, Jordyn Martin added 10 with eight rebounds and Kris Yanku chipped in 10 points and seven assists for the Lumberjacks (8-10, 3-2 Big Sky). Northern Arizona committed just seven turnovers and forced 17.
Northern Arizona trailed for most of the second half until Dixon hit a 3-pointer to go up 64-63. Marcus Bradley made a layup for Idaho State, and Bewernick followed with his three-point play.
Dixon nailed a key jumper for a four-point lead with 31 seconds left and Upshur sank three late free throws.