Biko Johnson had 19 points and Isaiah Brickner scored 15 — all in the second half — to propel Idaho to a 78-74 victory over No. 2 seed Montana State on Sunday night in a Big Sky Conference Tournament quarterfinal. No. 7 seed Idaho (19-14) moves on to Tuesday's semifinals where it will play the winner of a Monday quarterfinal between No. 3 seed Eastern Washington and sixth-seeded Weber State. Johnson made 7 of 12 shots with a 3-pointer for the Vandals, adding five rebounds and four assists.