It was the first win of the season for Idaho (1-2).
Connor Hill scored 12 points for Idaho.
Madison and Hill each connected for two 3-point shots, as did Denzel Douglas and Joe Kammerer.
Green Bay (2-3) got 19 points from Brennan Cougill and 13 from Keifer Sykes.
Green Bay’s Kam Cerroni scored 9 points, all on 3-pointers.
Idaho had a 19-9 scoring advantage off the bench and scored 11 fast-break points while keeping Green Bay off the board in that category.