Barone had 11 rebounds, and Madison had 10 to give both double-doubles.
Connor Hill and Mansa Habeeb added 10 points apiece for the Vandals (3-4).
Eastern Washington led 34-33 at halftime in a game that saw 22 lead changes. At 15:53 in the second half, the Eagles led by 17.
With 3:22 to play, a 3-pointer by Hill put Idaho up 65-62, and Madison made two free throws to make it 67-62.
Venky Jois hit a layup for the Eagles, and Justin Crosgile made a 3-pointer at 1:32 to tie the score at 67.
During overtime, Idaho shot 75 percent from the field. Eastern Washington (2-6) shot 42.9 percent.
Crosgile had 26 points. Jois had 13 points, 10 rebounds. Thomas Reuter added 11 and Martin Seiferth 10.
- Idaho beats Eastern Washington 81-79 in overtime
- Duke stuns No. 7 Virginia 63-62 on Allen's buzzer-beater
- Jackson leads Notre Dame to upset of No. 13 Louisville 71-66
- No. 5 Xavier finds shooting touch in 74-57 blowout at Butler
- No. 10 West Virginia routs TCU 73-42
- Barber's career-high 38 help NC State beat Wake Forest 99-88