“Employee” means a resident individual who performs or performed services for an employer anywhere or a nonresident individual who performs or performed such services within this state, and includes an officer, employee or elected official of the United States, a state, territory, or any political subdivision thereof, or the District of Columbia, or any agency or instrumentality of any one or more of these entities. The term includes an officer of a corporation, an entertainer and an entertainment corporation, but does not include a direct seller who is not treated as an employee under section 3508 of the Internal Revenue Code or a real estate broker or salesperson who is excluded under s. 452.38.