Every decision and order adverse to a party to the proceeding, rendered by an agency in a contested case, shall be in writing or stated in the record and shall be accompanied by findings of fact and conclusions of law. The findings of fact shall consist of a concise statement of the conclusions upon each contested issue of fact. Parties to the proceeding shall be notified of the decision and order in person or by mail. A copy of the decision and order and accompanying findings and conclusions shall be delivered or mailed upon request to each party or his or her attorney of record.