Idaho Code § 32-406

If any such minister or officer shall presume to solemnize any marriage between parties without such a license, or with knowledge that either party is legally incompetent to contract matrimony as is provided for by the laws of this state, he shall be deemed guilty of a misdemeanor, and, upon conviction thereof, shall be punished by a fine of not less than fifty dollars ($50.00) nor more than $200.00 before any court having jurisdiction.