Schematic view of the internal structure we assume for our small, icy moons. The uniform interior is where tidal and other endogenic heat is dissipated and generated; dissipation in the ocean, ice crust, and regolith is ignored in our model. Endogenic heat is then conducted toward the surface through the ocean, ice crust, and regolith. The ocean is assumed a perfect thermal conductor, whereas the ice crust and regolith cover have finite conductivity; the regolith is highly insulating and can be thought of as a blanket. Exogenic heat is incident on the regolith blanket, with a fraction being absorbed and the rest reflected into space.