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Earnings (Loss) Per Share
6 Months Ended
Jul. 31, 2011
Earnings Per Share [Abstract]  
Earnings (Loss) Per Share
6. Earnings (Loss) Per Share
          The Company calculates basic earnings (loss) per share by dividing net income (loss) by the weighted-average number of common shares outstanding during the reporting period. Diluted earnings (loss) per share reflects the effects of potentially dilutive securities. Since the Company incurred a net loss for the three and six months ended July 31, 2011 and 2010, basic and diluted loss per share were the same because the inclusion of potential common shares related to outstanding stock options in the calculation would have been antidilutive.
          Potential common shares of 10,275 and 4,288 have been excluded from diluted weighted average common shares for the three and six months ended July 31, 2011, as the effect would have been antidilutive. Similarly, potential common shares of 260,153 and 276,587 have been excluded from diluted weighted average common shares for the three and six months ended July 31, 2010, as the effect would have been antidilutive.