None are idle so far. I have gone back since I've learned more and done some tweaking here and there on all of my hubs, adding photos, images and videos, etc., double-checking spelling and grammar and typos, but I just joined in April, so I do not have hundreds of hubs to go back and tweak, which may be why I do not have any idle ones. Although, I do have some that had hardly any comments, and that is when I first started hubbing and no one knew me. It is good now with the new profile page that one can highlight hubs when one first began hubbing, after tweaking those a bit, and see if they do get anymore traffic. Idle must not mean zero traffic, as I would think some of mine would be idle. So, it must mean something else for some reason that I am not sure of at the moment.