The powers conferred by sections 70-1509—70-1512[, Idaho Code,] shall be in addition and supplemental to, and not in diminution of or substitution for any powers now or hereafter conferred upon any port district by this act or any other law. The provisions of such sections are intended to simplify the procedure for the construction and financing of port improvements, and are remedial in nature and the powers thereby granted shall be liberally construed; provided, that such section shall not be construed to authorize the issuance of general obligation bonds by such port, in excess of the limitations contained in this act and any such bonds shall be issued only upon compliance with the provisions of this act concerning the issuance of general obligation bonds.