Not quite the same thing, but I know of a company in my local town that hires only women. They'll contract out to men when they absolutely must (me, for example), but I shit you not, the owner was female, all of the engineers were female, every single person on the assembly line was female. There was literally 2 males involved in that entire company. Me, as a contract software developer, and another guy as a contract IT person.

That was it. Top to bottom that entire company was female, if I had to guess they had 20-30 employees, but of course I never saw all of them so it's just a guess.