Each witness who appears before the Legislative Council, any standing committee, or any special legislative investigative or oversight committee by subpoena of such council or committee, other than a state officer or employee, shall receive for attendance the fees provided for witnesses in civil cases in courts of record and mileage as provided in section 81-1176, which shall be audited and paid upon the presentation of proper vouchers sworn to by such witness and approved by the secretary and chairperson of the council.