Hansen shot 4 of 6 from distance and led Idaho State with seven rebounds. The Bengals (6-18, 3-9 Big Sky) shot 7 of 10 from 3-point range and 53.8 percent overall. Nnamdi Ezenwa finished with 15 points, four assists and three steals.
Hansen closed the first half with a layup and a 3-pointer, and the Bengals led 42-32 at intermission.
Idaho State led by as many as 15 points until the Lumberjacks (12-12, 7-4) went on a 10-2 run to close within seven with 6:40 remaining.
Treys from Quinton Upshur - who led the Lumberjacks with 24 - and Aaseem Dixon made it a five-point game with 4:19 left. Northern Arizona went cold for the next 2:59 and Idaho State led by double digits the rest of the way.