Quote from Grandluxe:
Norway has tonnes of North Sea oil for a small population. As a country,It produces per capita the most oil after the Middle East.
That being said, I do think that economic/social systems cannot be viewed in isolation, culture and social history makes a very big difference.
Participation in the Euro aside, All these countries mentioned that have been least affected by the euro debacle(Nordic countries and Germany, Netherlands,etc) share a common heritage and ancestry. They have similarities in culture, in language and in social attitudes.
Norwegian/Danish and Swedish are all north Germanic languages. Dutch is a West Germanic language. In cultures like these, there are very strong inclinations towards self-reliance, discipline, an obsession with perfection and great attention to detail. This kind of cultural attitude is not readily found in the rest of Europe. The other country that I can think of is Japan. It might have something to do with evolving to live in the cold environment.
The Nordic nations don't use the Euro.. Plus Norway isn't even part of the EU due to their love of whale hunting.