Thank you for the clarifications!
Someone from Iceland tried to explain this all to me once, and if I understood correctly, it had less to do with the GDP (which also includes money circulating within Iceland) and more to do with the balance of trade, where fishing played a bigger role? But my information may have been misunderstood, or it may be out of date.
In any case, you have a stunningly gorgeous country and very nice people, and I wish you the best of luck in figuring all this out in a way that benefits Iceland.