NPK International (NYSE:NPKI) reported quarterly earnings of $0.13 per share which beat the analyst consensus estimate of $0.11 by 22.64 percent. This is a 62.5 percent increase over earnings of $0.08 per share from the same period last year. The company reported quarterly sales of $75.195 million which beat the analyst consensus estimate of $68.849 million by 9.22 percent. This is a 30.72 percent increase over sales of $57.524 million the same period last year.