Here are some resources that describe, discuss, and lay out the characteristics of a small farm, what type of income can be expected from a small farm, and what practices individuals adopt in order to turn a profit on their small farm. Essentially, a small farm is like a small business, and requires personal commitment of labor and effort and ingenuity.
What Can I Do With My Small Farm? Oregon State University 2006
Small Farmers Creating a New Business Model as Farming Goes Local New York Times 2012
Small Farm Success Stores. USDA 2009