Ark. Code Ann. § 14-88-504: Priority of suits

(a) All suits which involve the validity of any municipal improvement district, of its assessment of benefits or any individual assessment, or of its power to make the improvement petitioned for, or which involve the title to office of any of the commissioners or assessors of the district, and all suits to collect its taxes laid on its assessed benefits, shall be deemed suits involving the public interest and shall be advanced in all courts and heard at the earliest practical moment.

(b) All appeals in these suits shall be taken and perfected within thirty (30) days.