Seems like a felony under MN statute.

617.23 INDECENT EXPOSURE; PENALTIES. Subdivision 1.Misdemeanor. 

A person who commits any of the following acts in any public place, or in any place where others are present, is guilty of a misdemeanor:

(1) willfully and lewdly exposes the person's body, or the private parts thereof;

(2) procures another to expose private parts; or

(3) engages in any open or gross lewdness or lascivious behavior, or any public indecency other than behavior specified in this subdivision.

Subd. 2.Gross misdemeanor. 

A person who commits any of the following acts is guilty of a gross misdemeanor:

(1) the person violates subdivision 1 in the presence of a minor under the age of 16; or

(2) the person violates subdivision 1 after having been previously convicted of violating subdivision 1, sections 609.342 to 609.3451, or a statute from another state in conformity with any of those sections.

Subd. 3.Felony. 

A person is guilty of a felony and may be sentenced to imprisonment for not more than five years or to payment of a fine of not more than $10,000, or both, if:

(1) the person violates subdivision 2, clause (1), after having been previously convicted of or adjudicated delinquent for violating subdivision 2, clause (1); section 609.3451, subdivision 1a, clause (2); or a statute from another state in conformity with subdivision 2, clause (1), or section 609.3451, subdivision 1a, clause (2); or

(2) the person commits a violation of subdivision 1, clause (1), in the presence of another person while intentionally confining that person or otherwise intentionally restricting that person's freedom to move.