(a) If a vacancy occurs in the office of director, the remaining directors by majority vote shall elect a director to hold office for the remainder of the unexpired term.
(b) If the number of directors is reduced to fewer than four for any reason, the remaining directors shall immediately call a special election to fill the vacancies. If the remaining directors do not call the election, a district court, on application of a qualified voter or taxpayer of the district, may order the directors to hold the election.