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Earnings per Share (Tables)
 9 Months Ended
Sep. 25, 2016
Earnings Per Share [Abstract]  
Schedule of the Calculation of Weighted Average Shares Outstanding for Basic and Diluted Earnings per Share

Basic and diluted income per share are calculated using the weighted average number of shares outstanding for the period as follows:

 

 

For the 13 Weeks Ended

 

 

For the 39 Weeks Ended

 

 

 

September 25,

 

 

September 27,

 

 

September 25,

 

 

September 27,

 

 

 

2016

 

 

2015

 

 

2016

 

 

2015

 

Net income attributable to Potbelly Corporation

 

$

1,795

 

 

$

1,401

 

 

$

6,256

 

 

$

4,393

 

Weighted average common shares outstanding-basic

 

 

25,240,374

 

 

 

27,850,394

 

 

 

25,772,846

 

 

 

28,450,063

 

Plus: Effect of potential stock options exercise

 

 

533,249

 

 

 

471,579

 

 

 

514,257

 

 

 

630,043

 

Plus: Effect of potential warrant exercise

 

 

56,347

 

 

 

47,802

 

 

 

54,810

 

 

 

57,431

 

Weighted average common shares outstanding-diluted

 

 

25,829,970

 

 

 

28,369,775

 

 

 

26,341,913

 

 

 

29,137,537

 

Income per share available to common stockholders-basic

 

$

0.07

 

 

$

0.05

 

 

$

0.24

 

 

$

0.15

 

Income per share available to common stockholders-diluted

 

$

0.07

 

 

$

0.05

 

 

$

0.24

 

 

$

0.15

 

Potentially dilutive shares that are considered anti-dilutive:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Common share options

 

 

1,233,294

 

 

 

1,192,579

 

 

 

1,236,599

 

 

 

803,582

 

Warrants

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—