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Earnings per share
9 Months Ended
Sep. 30, 2013
Earnings per share [Abstract]  
Earnings per share
3.Earnings per share:

Basic earnings per share represent income available to common stockholders divided by the weighted-average number of common shares outstanding during the period.  Diluted earnings per share reflect additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustment to income that would result from the assumed issuance.  Potential common shares that may be issued by the Company relate solely to outstanding stock options, and are determined using the treasury stock method.
Stock options for 2,878 and 5,800 shares of common stock were not considered in computing diluted earnings per share for the three and nine months ended September 30, 2013 and 2012, respectively, because they were antidilutive.