Tiny schools/ Decreasing schools

photo by remoto 13 en FLICKR

This post was inspired by Agnetta's post about her school. It reminded me of a problem we have here in Spain in rural regions: Many Primary schools have to close due to lack of children in the villages.
I used to work in a Secondary School which received pupils from little villages, and I could see how most of them were the only young people left in their villages and that they sadly enough left the village for good when they went to study to the University or moved to the capital for seeking better opportunities.
Do you have the same problem in your countries? How do the authorities deal with it?
I am also curious about the methods used by teachers of this kind of school who must work with pupils of different ages and levels. I hope you find the topic interesting enough.
For those who can read Spanish I include this link where you can find an example.