Well, it's not a superman like flight, but it is something... And i wonder why they didn't mastered this power, since it is a very usefull one. Imagine anakin flying over obi-wan in ROTS or even sidious flying or gliding when vader throwed him in ROTJ.
It makes no sense that a jedi master like yoda can lift tons of weight but can't fly his light body. And we can also see this in KOTOR when Revan is meditating and floating during his training in Dantooine. Maybe he could fly too...