“Compensation” means the salary paid to a justice of the Supreme Court, a judge of the Court of Appeals or a district judge by this State, to a justice of the peace by a county or to a municipal judge by a city, including:
Base pay, which is the monthly rate of pay excluding all fringe benefits;
Additional payment for longevity; and
Payment for extra duty assignments if it is the standard practice of this State, the county or the city to include such pay in the employment contract or official job description for the calendar year in which it is paid and such pay is specifically included in the justice’s or judge’s employment contract or official job description.
The term does not include any type of payment not specifically described in this section.