There isn't anything related to farming on there. Seems odd, especially when they're just talking about revenue and with how much money is in that sector right now.
At 6.60 / bushel corn @ 200 bushels per acre, it "only" takes 760 acres of corn to break the $1M revenue barrier. 760 acres isn't necessarily a lot and can be definitely run by one person, especially with some contractor help.
It probably has something to do with what's classified as a Non-Employer, but it just seems like it should be there.