Idaho has released new voter registration data. The percentages for each party are: Republican 32.42%, Democratic 7.63%, Libertarian .46%, Constitution .23%, other or independent 59.27%.
UPDATE: here is a newer state compilation, dated Feb. 1, 2014: Republican 32.45%, Democratic 7.64%, Libertarian .46%, Constitution .23%, other or independent 59.23%.
In November 2012, the percentages were: Republican 25.02%, Democratic 4.62%, Libertarian .17%, Constitution .07%, other or independent 70.13%. Idaho did not have partisan registration until mid-2011, and in the beginning, all voters were deemed independent, until they took actions to register into a party. That is why the percentage of people registered in parties is so much higher now than it was in 2012.
Idaho Democratic Party registration is still so low, that if Idaho had Pennsylvania’s election laws, the Democrats would be off the ballot. Pennsylvania only gives automatic ballot access to parties that have 15% of the state registration total. Thanks to Michael for the link.