I've met and know several expats and have been one myself in the US. One thing I have heard from several of them is that Norwegians are hard to befriend, but once you get close to them you have a friend for life. It's not unheard of of friends not really talking or socializing for a long time, even years. But once you do contact them or meet up with them again the friendship picks up right where it left off not skipping a beat.