First, the state constitution ensures that our right to open carry cannot be denied.
This was tested in a court case in the early 1900's.
In re Brickey, 8 Idaho 597 (1902), which says in relevant part:
While it is, undoubtedly, within the power of the legislature to prohibit the carrying of concealed deadly weapons, and such regulation is a proper exercise of police power, yet the legislature does not possess the power to prohibit the carrying of firearms, as the right to do so is guaranteed to the citizen both by our federal and state constitutions.
The syllabus above (written by the Court), is express in the actual holding, below:
A statute prohibiting the carrying of concealed deadly weapons would be a proper exercise of the police power of the state. But the statute in question does not prohibit the carrying of weapons concealed, which is of itself a pernicious practice, but prohibits the carrying of them in any manner in cities, towns, and villages. We are compelled to hold this statute void.
http://www.guncite.com/court/state/70p609.html
There, now you can stop hyperventilating.
This case is the precedence all other cases are based on.
That's ACTUAL constitutional carry. Not permit-less carry like the other states have gone.