An individual is liable to the department for the value of assistance or benefits improperly paid to the individual under AS 47.45.302 or former AS 47.45.310 or 47.45.320 if the improper payment was based on inaccurate or incomplete information provided by the individual. In a civil action brought by the state to recover from the individual the value of assistance or benefits improperly paid under AS 47.45.302 or former AS 47.45.310 or 47.45.320, the state may recover from the individual the costs of investigation and prosecution of the civil action, including attorney fees as determined under court rules.