Every decision and order in a contested case shall be in writing, and, except in default cases or cases disposed of by stipulation, consent order or agreed settlement, the decision, including orders refusing licenses, shall include or be accompanied by findings of fact and conclusions of law. The findings of fact shall be stated separately from the conclusions of law and shall include a concise statement of the findings on which the agency bases its order. Immediately upon deciding any contested case the agency shall give written notice of its decision by delivering or mailing such notice to each party, or his attorney of record, and shall upon request furnish him with a copy of the decision, order, and findings of fact and conclusions of law.