This is an interesting question. Okay, I don't mean to sound like a smartypants with this, but if we remove the Jet/Powermatic conglomerate from the equation, and maybe Sorby, and Record Power, and Chinese-based businesses, isn't just about all that remains for tools, machinery, and accessories considered, by definition, small businesses serving the woodturning community?
With so many of the woodturning manufacturers that cater to us, if you call their phone number, it seems you have a 50/50 chance that the owner will answer the phone. That's pretty much any of the cutting tool makers (shy of Sorby), same for the machine builders.
Well, anyway, today woodturning as a whole is a pretty niche "industry" once you leave the realm of CNC and true factory production work. Heck, when you think about it, there are probably less of us "single person woodturning shops" now than there were 200 years ago. Back then, you and I were doing this for a living in our towns and villages, making architectural and furniture turnings, and kitchenwares, on tredle or spring pole lathes, using cutters made by the blacksmith down the road.. Now we do the same, but as hobbiests, or one-off and micro-scale gallery sellers, using tools and equipment that are light years ahead in technology. We should respect what they had then compared to what we have now.
Sorry, I didn't actually answer the question.