Idaho Code § 30-30-616: Quorum and voting.

(1) Except as otherwise provided in this act, the articles or bylaws, a quorum of a board of directors consists of a majority of the directors in office immediately before a meeting begins. In no event may the articles or bylaws authorize a quorum of fewer than the greater of one-third (1/3) of the number of directors in office or two (2) directors.

(2) If a quorum is present when a vote is taken, the affirmative vote of a majority of directors present is the act of the board unless this act, the articles or bylaws require the vote of a greater number of directors.