(FOX NEWS)-Two Christian ministers who own an Idaho wedding chapel were told they had to either perform same-sex weddings or face jail time and up to a $1,000 fine, according to a lawsuit filed Friday in federal court.

Alliance Defending Freedom is representing Donald and Evelyn Knapp, ordained ministers who own the Hitching Post Wedding Chapel in Coeur d’Alene.

“Right now they are at risk of being prosecuted,” their ADF attorney, Jeremy Tedesco, told me. “The threat of enforcement is more than just credible.”

According to the lawsuit, the wedding chapel is registered with the state as a “religious corporation” limited to performing “one-man-one-woman marriages as defined by the Holy Bible.”

But the chapel is also registered as a for-profit business – not as a church or place of worship – and city officials said that means the owners must comply with a local nondiscrimination ordinance.

That ordinance, passed last year, prohibits discrimination based on sexual orientation, and it applies to housing, employment and public accommodation