Mich. Comp. Laws § 450.3132

Sec. 1132. Subject to section 304(7), membership in a consumer cooperative subject to this act shall be available to all patrons of the cooperative who are consumers. The bylaws may make membership available to other patrons. For any other cooperative, 50% or more of the patronage shall be with members or, subject to section 304(7), membership shall be available to all patrons. All cooperatives shall give all patrons reasonable notice of the qualifications for membership.