Should a virtual method in a abstract base class throw?

My abstract base class implements an interface and a method like so:

public interface IFoo
{
       void Bar();
}

public abstract class Foo : IFoo
{
      public virtual void Bar()
      {
          throw new NotImplementedException();
      }
}

Since the base class has no default implementation of this method and I can't make the method abstract, is it reasonable to let the base implementation throw or should it just return? What is the common approach to this? Thanks!