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Earnings (Loss) Per Share | 12 Months Ended
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Dec. 27, 2020
Earnings Per Share [Abstract] |
Earnings (Loss) Per Share | (4) Earnings (Loss) Per Share Basic earnings (loss) per common share attributable to common stockholders are calculated using the weighted average number of common shares outstanding for the period. Diluted earnings (loss) per common share attributable to common stockholders is computed by dividing the income allocated to common stockholders by the weighted average number of fully diluted common shares outstanding. In periods of a net loss, no potential common shares are included in diluted shares outstanding as the effect is anti-dilutive. For fiscal years 2020, 2019 and 2018, the Company had a loss per share, therefore, shares were excluded for potential stock option exercises. The following table summarizes the earnings (loss) per share calculation (in thousands):
|  | Fiscal Year |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Net loss attributable to Potbelly Corporation |  | $ | (65,391 | ) |  | $ | (23,992 | ) |  | $ | (8,878 | )
Weighted average common shares outstanding-basic |  |  | 23,899 |  |  |  | 23,850 |  |  |  | 25,173 |
Plus: Effect of potential stock options exercise |  |  | — |  |  |  | — |  |  |  | — |
Weighted average common shares outstanding-diluted |  |  | 23,899 |  |  |  | 23,850 |  |  |  | 25,173 |
Loss per share available to common stockholders- basic |  | $ | (2.74 | ) |  | $ | (1.01 | ) |  | $ | (0.35 | )
Loss per share available to common stockholders- diluted |  | $ | (2.74 | ) |  | $ | (1.01 | ) |  | $ | (0.35 | )
Potentially dilutive shares that are considered anti-dilutive: |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  | 2,754 |  |  |  | 2,334 |  |  |  | 2,499 |

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