Okla. Stat. tit. 18, § 18-441-823
Resignation and removal of officers
RESIGNATION AND REMOVAL OF OFFICERS.
(a) The board of directors may remove an officer at any time
with or without cause.
(b) An officer of a limited cooperative association may resign
at any time by giving notice in a record to the association. Unless
the notice specifies a later time, the resignation is effective when
the notice is given.