I have heard this usage form many of my friends that are not from the south at all, they happen to be from the Norther counties of Indiana near Chicago. I do know that it happens quite often in the Souther states and I think it is in the Dialect. The Northern counties of Indiana are not in the Midland Dialect and even though most of the Southern counties are there is still heavy influence from other dialects also, this is probably the reason for the 'Ideal' - 'Idea' flip.