A port commission may adopt by resolution one or more supplemental budgets at any time during the fiscal year. Such supplemental budget shall be adopted only after public hearing. Notice of such hearing shall be given by a single publication of notice of the date, place and hour of the hearing in a legal newspaper of the district, or if there is none, in any newspaper of general circulation in the county, the publication of such notice to be at least five days and not more than fifteen days prior to the hearing date.