There's two ways of looking at this which I think are interesting, on one hand having no military shows other countries and the world that you don't mean them any harm and want to live in peace, on the other hand it also shows them you are an easy target because you can't fight back. 
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 But why would anyone attack them if there's nothing to plunder ... no natural resources  

 True, possibly control or something  

 Tough location to invade, good defensive position. Also, only half kidding but, who would want to fight the descendants of Vikings. Not me.