Idaho Code § 67-404: Sessions of legislature.

At the hour of twelve o’clock M. on the Monday on or nearest the ninth day in January the regular session of the legislature shall be convened. The presiding officer must call the same to order and preside. Neither house must transact any business, but must adjourn from day to day, until a majority of all the members authorized by law to be elected are present. Each legislature shall have a term of two (2) years, commencing on December 1 next following the general election, and shall consist of a "First Regular Session" which shall meet in the odd-numbered years and a "Second Regular Session" which shall meet in the even-numbered years and any extraordinary session or sessions which may be called as provided by law.