The compensation of members of Council and the Mayor may be increased or decreased at any time; however, if such increase occurs during the term of persons holding such positions, the increase shall not be effective until the expiration of two years after the effective date of the ordinance increasing such salaries or the end of the term of the persons holding such positions, whichever shall occur first. The compensation of all other officers and employees of the Municipality may be increased or decreased at any time by ordinance. Members of Council shall receive their actual and necessary expenses incurred in the performance of their duties of office.