If, after due notice, an employer defaults in any payment of contributions or interest thereon, the amount due may be collected by civil action in the name of the commission, and this remedy shall be in addition to such other remedies as may be herein provided or otherwise provided by law. An employer adjudged in default shall pay the costs of such action. Civil actions brought under this section to collect contributions or interest thereon from an employer shall be heard by the court at the earliest possible date, and shall be entitled to preference upon the calendar of the court over all other civil actions except petitions for judicial review of claims for benefits under this chapter.