We compute earnings per share using the two-class method in accordance with ASC 260, Earnings Per Share. The two-class method is an allocation of earnings between the holders of common stock and a company’s participating security holders. Our outstanding nonvested shares of restricted stock contain non-forfeitable rights to dividends and, therefore, are considered participating securities for purposes of computing earnings per share pursuant to the two-class method. We had no other participating securities at December 31, 2015 or 2014.

Contingently issuable shares associated with outstanding service-based restricted stock units were not included in the earnings per share calculations for the year ended December 31, 2015, as the vesting conditions had not been satisfied. No such restricted stock units existed in 2014.

Certain options to purchase FutureFuel’s common stock were not included in the computation of diluted earnings per share for the years ended December 31, 2015 and 2014 because they were anti-dilutive in the period. The weighted number of options excluded on this basis was 97,500 and 25,000, respectively. No options to purchase shares of FutureFuel’s common stock were excluded from the computation of diluted earnings per share for the year ended December 31, 2013.