The Council shall be the judge of the election and qualification of its members and, in such cases, shall have power to subpoena witnesses and compel the production of all pertinent books, records, and papers; but the decision of the Council in any such case shall be subject to review by the courts. The Council shall determine its own rules and order of business and keep a journal of its proceedings. It shall have power to compel the attendance of absent members, may punish its members for disorderly behavior and, by vote of not less than all of the members elected to Council less two, may expel a member for disorderly conduct or the violation of its rules; but no member shall be expelled unless notified of the charge against him and given an opportunity to be heard in his own defense. For each absence of a member of Council from a regular meeting of the Council, unless excused by a majority vote of all members thereof there shall be deducted from his salary a sum equal to two percent of the annual salary of such member. Absence from five consecutive regular meetings shall operate to vacate the seat of a member unless such absence is excused by the Council by a motion or resolution setting forth such excuse and entered upon the journal.