Nonprofit organization--
(a) Means any corporation, trust, association, cooperative, or other organization that--
(1) Is operated primarily for scientific, educational, service, charitable, or similar purposes in the public interest;
(2) Is not organized primarily for profit; and
(3) Uses net proceeds to maintain, improve, or expand the operations of the organization.
(b) Includes nonprofit--
(1) Institutions of higher education;
(2) Hospitals; and
(3) Tribal organizations other than those included in the definition of ``Indian Tribe.''