Net earnings per share is calculated using the weighted average number of shares of common stock outstanding during the applicable period. Basic weighted average shares of common stock outstanding do not include shares of restricted stock that have not yet vested, although such shares are included as outstanding shares in the Company’s Consolidated Balance Sheet. Diluted net earnings per share is computed using the weighted average number of common shares outstanding and if dilutive, potential common shares outstanding during the period. Potential shares of common stock consist of the additional shares of common stock issuable in respect of restricted share awards, stock options and convertible preferred stock. Preferred stock dividends are subtracted from net earnings to determine the amount available to common stockholders.

The following table presents the computation of basic and diluted net earnings per share:

There are 124,168 and 111,668 common stock options that are anti-dilutive that are not included in the three month and nine months ended June 30, 2017 diluted earnings per share computations, respectively.