The words "poor" and "poor person" as used in this chapter shall be construed to mean those who have no property, exempt or otherwise, and are unable, because of physical or mental disabilities, to earn a living by labor; but this section shall not be construed to forbid aid to needy persons who have some means, when the board shall be of opinion that the same will be conducive to their welfare and the best interests of the public.
Iowa Code § 252.1