They are not. I first saw Star Wars at Q Cinema 4 in Millard, Nebraska. It expanded to Q Cinema 6, then it became Douglas Q Cinema 9. It was closed and demolished in 2008.

http://www.cinematour.com/picview.php?db=us&id=3573

The other was Indian Hills Theater in Omaha. Saw Star Wars in 70mm. Unfortunately, that landmark was demolished in 2001 due to high renovation costs (and pure greed).

http://www.flickr.com/photos/neatocoolville/91817548/sizes/o/in/set-72057594054766350/

Q Cinema 4 is where I first saw Tommy Jung's poster before the movie came out. That image alone made me want to see the movie.