The OMA applies to state and local bodies. Mich. Comp. Laws Ann. § 15.262(a). The OMA supersedes all local provisions requiring meetings of local public bodies to be open to the public. However, nothing in the OMA prohibits public bodies from adopting provisions which would require a greater degree of openness than is required by the standards provided for in the OMA. Mich. Comp. Laws Ann. § 15.261.