BRIEF-Dynatronics announces 16.6% increase in revenues for fiscal 2017 second quarter
GLOBAL MARKETS-World stocks at 21-month highs on Yellen, U.S. outlook
LONDON, Feb 15 World stocks hit 21-month peaks on Wednesday and the dollar rose for the 11th straight day, after Federal Reserve Chair Janet Yellen flagged a possible interest rate rise next month during upbeat comments on the U.S. economy.