Idaho Code § 33-502B
In any election for trustees, if, after the expiration of the date for filing written nominations for the office of trustee, it appears that only one (1) qualified candidate has been nominated for a position to be filled or if only one (1) candidate has filed a write-in declaration of intent as provided by section 34-1407, Idaho Code, and has provided to the district's board clerk the signatures of five (5) electors of the candidate's specific zone, then no election shall be held for that position. The board of trustees or the school district clerk, with the written permission of the board, shall declare such candidate elected as a trustee. The school district clerk shall immediately prepare and deliver to the person a certificate of election signed by him and bearing the seal of the district. The procedure set forth in this section shall not apply to any other school district election.
Idaho Code § 33-502B