All meetings of the board shall be open to the public. No business of the board shall be transacted except at a regular or special meeting at which a quorum consisting of at least three-fifths of the total membership of the board is present. Any action of the board requires the affirmative vote of a majority of the directors present and voting. A smaller number of directors than a quorum may adjourn from time to time and may compel the attendance of absent members in the manner and under such penalties as the board may provide.