Idaho Code § 70-1613
Upon following the procedural steps established by chapter 28, title 67, Idaho Code, for receipt of bids, as modified by provisions of this title, the port commission shall proceed to canvass the bids, and at the proper time thereafter may let the contract upon the bid which the commission determines to be the best responsible bid, whether or not the same be the lowest bid, upon the plans and specifications on file, or the best responsible bid of a bidder submitting his own plans and specifications. If, in the opinion of the commission, all bids are unsatisfactory, they may reject all of them and readvertise, and in such case all such bid proposal deposits shall be returned to the bidders; but, if the contract is let, then all bid proposal deposits shall be returned to the bidders, except that of the successful bidder, which shall be retained until a contract is entered into for the purchase of such material or doing of such work. A bond shall be given to the port district by the successful bidder for the performance of the contract and otherwise conditioned as required by law, with surety satisfactory to the commission, in an amount to be fixed by the commission, but not in any event less than twenty-five percent (25%) of the contract price. If said bidder fails to enter into the contract in accordance with his bid and furnish such bond within ten (10) days from the date on which he is notified that he is the successful bidder, the check or money order and the amount thereof shall be forfeited to the port district, or the port district shall recover the amount of the surety bid bond. In the alternative, a port district may, by passage of a resolution by the board of commissioners, elect to exclusively follow the provisions of chapter 28, title 67, Idaho Code, concerning procurement.
Idaho Code § 70-1613