Statewide Delegates: Winner Take all if the top candidate receives a majority of votes or the top candidate is the only candidate to receive at least 20 percent of the vote, otherwise delegates are awarded proportionally to those candidates that receive more than 20 percent of the vote.
Source for Popular Vote data: Idaho Secretary of State. Primary Election (to county level) Issued by Lawerence Denney, Secretary of State, Idaho Secretary of State (http://www.sos.idaho.gov/elect/results/2016/PresidentialPrimary/16Pres_pri_stwd_cnty.xlsx) (accessed 27 Mar 2016)