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Earnings per share
3 Months Ended
Mar. 31, 2015
Earnings per share [Abstract]  
Earnings per share
3.  Earnings per share

Basic net income per share was computed on the weighted average number of shares outstanding.  Diluted net income per share was computed under the treasury stock method, assuming the conversion as of the beginning of the period, for all dilutive stock options.  Of 721 thousand and 676 thousand shares and options outstanding at March 31, 2015 and 2014, respectively, 84 thousand and 96 thousand were anti-dilutive, respectively.  These shares and options have been excluded from the computations of diluted earnings per share for their respective period.  There were no adjustments to net income for either period.