Ben Jacobson had 14 points and five assists for the Panthers (22-6), who improved to 12-2 at home. Erik Crawford made a game-tying goal with one second left in the first overtime, and finished with 12 points.
Charles Lee had 15 points and 11 rebounds for Bucknell (21-4), which had a 12-game winning streak halted. Abe Badmus scored 12 points in the loss.
Northern Iowa trailed by nine with under four minutes remaining in regulation but outscored the Bison 12-3 down the stretch to force overtime.