Mich. Comp. Laws § 450.2110

Sec. 110. (1) "Volunteer" means an individual who performs services for a corporation, other than services as a volunteer director, who does not receive compensation or any other type of consideration for the services other than reimbursement for expenses actually incurred. (2) "Volunteer director" means a director who does not receive anything of more than nominal value from the corporation for serving as a director other than reasonable per diem compensation and reimbursement for actual, reasonable, and necessary expenses incurred by a director in his or her capacity as a director.