Membership in associations without capital stock may be acquired by eligible parties in the manner provided in the articles, which shall specify the rights of members, the issuing price of memberships, if any, and what, if any, fixed dividends accrue thereon. If the articles so provide, membership shall be of two classes, voting and nonvoting. Voting members shall be agricultural producers, and all other members shall be nonvoting members. Nonvoting members shall have all the rights of membership except the right to vote.