This is more than "small town radio". It is an LPFM, run by a broadcast engineer with a love for oldies. Since LPFM stations can't sell commercials, they must run either from the licensee's own funds or donations. So KFXM is a labor of love, not intended to make a profit. As such, it can play anything it wants as it is not dependent on revenue or ratings.
You say "Mojave Desert" when, in fact, the market's name is the Antelope Valley and it is home for nearly 450,000 persons in the Lancaster / Palmdale metro area. Of course, the 100 watt signal of KFXM does not reach them all, but the station is a good example of what LPFM stations can be: a source of programming that is not viable on commercial or even big non-commercial stations.