"It is Unlawful• To hunt any animal or bird by aid of a spotlight, flashlight or artificial light of any kind; except unprotected or predatory animals on private land after obtaining written permission and on public lands after obtaining a permit. It is lawful to hunt raccoons on public lands without a permit if such taking is not in violation of state, county, or city laws, ordinances, or regulations." (page 34 in the furbearers pamphlet)
This is quoted out of the IDFG new rules and regulations, I would check into it but you may be able to spotlight foxes now with a permit, they are generally a nocturnal animal.