In misdemeanor cases, after the plea of the defendant has been entered, if he pleads not guilty, the defendant or prosecuting attorney may demand a jury; but if no jury is demanded, the case may be tried by the associate circuit judge.
§ 543.200, RSMo
RSMo 1939 § 3825, A.L. 1945 p. 750 § 20, A.L. 1978 H.B. 1634, A.L. 1993 S.B. 180