Delaware adopted the yield at stop signs a few years ago.
Some above are missing the point of the law. Going through stop signs is permissible when safe to do so, meaning no cars near. When a car and bike approach, it's not safe and the bike should honor the sign and stop. If the car waves you on, fine, but physics demands that the car has the right of way. The bike is +/-20 pounds and the car is +/-3000 pounds. It's like bringing a knife to a gun fight (actually a butter knife). In short, when bikes and cars are sharing the road in near proximity, bikes should follow the same rules as cars. The new laws apply when there are no cars near. It's also common sense.
I see the Idaho Stop law most useful when dealing with 4-way stops. In this case, the car approaching the intersection on the crossing street must stop at the stop sign, which means they have no more right of way than we do. I still stop when the car is very close to the stop sign (who knows, they may just run it), but not if there's plenty of room between them and the corner.