The magistrate shall set all criminal cases for a trial at a date not later than 30 days after plea is received, or in those cases in which the charge has been reduced on preliminary hearing, then at a date not later than 30 days from fixing of charge or receipt of transcript as the case may be. Continuances beyond such date shall be granted only upon notice to the opposing party and for good cause shown.
(R.C. § 2938.03) (‘74 Code, § 32.36)