According to The Idaho Statesman, one gay couple was able to get married in Twin Falls, Idaho before Supreme Court Justice Anthony Kennedy issued his stay of the 9th Circuit's ruling striking down bans on same-sex marriage in Idaho and Nevada. Same-sex couples were supposed to be able to begin marrying immediately in both states following a mandate issued by the 9th Circuit.
It is unclear at this time whether other same-sex couples in Idaho, or Nevada for that matter, were able to get marriage licenses before Justice Kennedy's stay was imposed.