Delaware constitution
Article IV
Section 4

The Justices of the Supreme Court, the Chancellor and the Vice-Chancellor or Vice-Chancellors, the President Judge and Judges of the Superior Court, the Chief Judge and Judges of the Family Court, the Chief Judge and Judges of the Court of Common Pleas and the Chief Magistrate of the Justice of the Peace Court shall respectively receive from the State for their services compensations which shall be fixed by law and paid monthly and they shall not receive any fees or perquisites in addition to their salaries for business done by them except as provided by law. They shall hold no other office of profit.