 AeroCentury Corp. NYSEAMERICAN:ACY was the recipient of a large increase in short interest in June. As of June 15th, there was short interest totalling 20,000 shares, an increase of 212.5 from the May 31st total of 6,400 shares. Currently, 1.7 of the companys shares are sold short. Based on an average trading volume of 102,500 ... 