Idaho Code § 23-914
All liquor sold by any licensee shall be purchased from the division through its regular retail stores and distributing stations at the posted price thereof. The division is hereby authorized and directed to make such sales pursuant to section 23-309, Idaho Code, upon a special permit issued to such licensee in such form as shall be prescribed by the director of the division. The posted price as used herein shall mean the retail price of such liquor as fixed and determined by the division.
It shall be unlawful for any licensee to sell, or keep for sale, or have on his premises for any purpose whatsoever, any liquor except that purchased as herein authorized and provided, and any licensee found in possession of, selling or keeping for sale any liquor not purchased as herein authorized shall be guilty of a felony and upon conviction thereof shall be fined not less than one thousand dollars ($1,000) nor more than five thousand dollars ($5,000), or by imprisonment in the state prison for not more than five (5) years, or by both such fine and imprisonment. Any license issued to such person shall be immediately and permanently revoked. The amount of liquor to be sold to licensees hereunder in any city or village shall be determined by the director or other executive officer of the division, but such sales shall be regulated so as to maintain adequate stocks of merchandise for sale to persons other than said licensees.
The provisions of this section notwithstanding, railroad companies shall have the right to have in their possession liquors other than those purchased from the division.
Idaho Code § 23-914