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Income (Loss) Per Share
3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
3.  Income (Loss) Per Share
 
Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period. Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period plus dilutive common stock equivalents, using the treasury stock method.
 
Common stock equivalents for convertible preferred stock of 1,238,941 and 1,321,537 shares were excluded from the calculation of loss per share for the three months ended March 31, 2016 and 2015, respectively, because they were not dilutive; these shares would have been dilutive if the Company had not had a net loss for the these periods.
 
Stock options for the purchase of 175,000 and 200,000 shares of the Company’s common stock were excluded from the calculation of income per share for the three months ended March 31, 2016 and 2015, respectively, because they were anti-dilutive.