Idaho Code § 31-714
The board of county commissioners may pass all ordinances and rules and make all regulations, not repugnant to law, necessary for carrying into effect or discharging the powers and duties conferred by the laws of the state of Idaho, and such as are necessary or proper to provide for the safety, promote the health and prosperity, improve the morals, peace and good order, comfort and convenience of the county and the inhabitants thereof, and for the protection of property therein, and may enforce obedience to such ordinances with such fines or penalties, including infraction penalties, as the board may deem proper; provided, that the punishment of any offense shall be by fine of not more than one thousand dollars ($1,000) or by imprisonment not to exceed six (6) months, or by both such fine and imprisonment.
Idaho Code § 31-714