OK, third times a charm or you don't get the info, lol!
American Transportation Research Institute has a website that I can't get to show up correctly in this post. They are known as ARTI, the web address is ARTI-online.org (in my previous two post this address has shown up as WELCOME (?). In any event if you get to this website click on Compendium Of Idling Regulations, it can be found on the mid left side of the page. Once there, you can get a list of idling laws state by state.
Now, wasn't that complicated?