NEW YORK (Reuters) - They may be a small minority in corporate boardrooms, but women directors typically earn more than men, a new U.S. study has found. Female directors in corporate America earned median compensation of $120,000, based on the most recently available pay data, compared with $104,375 for male board members, research group The Corporate Library said in its annual director pay report on Wednesday. At the same time, the study said, women in corporate boardrooms are outnumbered eight to one. "This makes being a director one of the few jobs in the U.S. economy where the pay differential...