 IsoRay, Inc. NYSEAMERICAN:ISR was the target of a large drop in short interest in the month of June. As of June 15th, there was short interest totalling 2,170,000 shares, a drop of 12.9 from the May 31st total of 2,490,000 shares. Based on an average daily trading volume, of 488,600 shares, the short-interest ratio is ... 