How are these small schools funded?
By school tax that goes to the local ISD?
Or by a combination of funds from students’ parents, local companies, and sales tax?
Check out the current situation in some states w.r.t school tax; it’s out the roof... see Texas for example (Katy does NOT need a 10 million dollar stadium).
The micro-schools funded by homeschooling co-ops are funded by parents, though some are supported by religious congregations.