Migrating a database from one PostgreSQL server to another cleanly
This is a reasonable plan if a planned maintenance of a few minutes up to an hour maybe is no big thing for you. 

The database is real small and should be imported within seconds on the new server. 

If the downtime is an issue for you, you should consider replicating the server with Slony (http://slony.info/) and then make the replicating slave finally the new master.