Net income (loss) per share is computed by dividing net income by the daily weighted average number of common shares outstanding during the applicable periods. Diluted net income per share includes the potentially dilutive effect of common shares subject to outstanding stock options and restricted stock awards using the treasury stock method. Under the treasury stock method, shares subject to certain outstanding stock options and restricted stock awards have been excluded from the calculation of the diluted weighted average shares outstanding because the exercise of those options or the vesting of those restricted stock awards would lead to a net reduction in common shares outstanding. As a result, stock options and restricted stock awards to acquire 2,000 and 50,919 weighted common shares have been excluded from the diluted weighted shares outstanding for the three-month periods ended June 30, 2019 and 2018, respectively, and 2,000 and 96,004 weighted common shares have been excluded from the diluted weighted shares outstanding for the six-month periods ended June 30, 2019 and 2018, respectively.

A reconciliation of net income per share is as follows (in thousands, except per share data):

	Three-Month Periods Ended June 30,				Six-Month Periods Ended June 30,
	2019		2018		2019		2018

Numerator:
Net income	$	647	$	511	$	955	$	494
Denominator:
Weighted average common shares outstanding		5,244		5,206		5,234		5,194
Dilutive potential common shares		15		13		14		—
Shares used in diluted net income per common share calculations		5,259		5,219		5,248		5,194
Basic net income per common share	$	0.12	$	0.10	$	0.18	$	0.10
Diluted net income per common share	$	0.12	$	0.10	$	0.18	$	0.10