By Bret Kenwell Norwegian Cruise stock is trading higher on earnings. If it can maintain the gains, more upside could be in the cards. Norwegian Cruise Line (NCLH) – Get Free Report is up about 5.5% so far on Tuesday, after the company reported earnings before the open. The company reported a top- and bottom-line beat, while its revenue outlook for next quarter came in at $1.4 billion to $1.5 billion. That’s roughly in-line but just a little bit below consensus expectations of $1.46 billion. That was better than the mixed report investors heard from Royal Caribbean (RCL) – Get Free Report last…