It's been a while since I looked at it and it depends on what you consider a "small farm" to be. But when I last checked a few years ago, farms employing little or no outside laborers were a small minority. And more significantly here, those households were both above median household income and half or more of their income came from outside-the-farm sources.
You can twiddle with it if you want but to me that seems like a pretty reasonable definition of "hobby farming." Which is not a value judgement per se. Not being strictly dependent on farm income allows these farmers to pursue traditional or sustainability-focused practices that may not be economically viable otherwise.
But just be clear-eyed about it. The ideal of the small, self-sufficient, productive and profitable family farm is just that, an ideal and to a large extent a myth. In a very serious way it's not how things ever worked and, maybe unfortunately maybe not, it's not how they're going to now either.