Oil companies can still get licenses and drill in Norway, they just have to pay taxes (80%) and that won't change.
The people decided in two referendums that they do not want to be in the EU, but the politicians did not accept it and created the EAA/EĆS which basically puts us in EU in all but name with very limited power to influence what happens there. It was not democratically done.
So maybe it's better to have no deciding voice but be able to keep all the money.