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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Calculation of Basic Earnings Per Share |
|  | (in thousands of dollars) |  |  | (in thousands of dollars) |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2018 |  |  | June 30, 2017 |  |  | June 30, 2018 |  |  | June 30, 2017 |
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 4,114 |  |  | $ | 3,223 |  |  | $ | 7,881 |  |  | $ | 6,062 |
Less: distributed earnings allocated to participating securities |  |  | (13 | ) |  |  | (11 | ) |  |  | (25 | ) |  |  | (21 | )
Less: undistributed earnings allocated to participating securities |  |  | (28 | ) |  |  | (19 | ) |  |  | (54 | ) |  |  | (36 | )
Net earnings available to common shareholders |  | $ | 4,073 |  |  | $ | 3,193 |  |  | $ | 7,802 |  |  | $ | 6,005 |
Weighted average common shares outstanding including participating securities (1) |  |  | 9,265,898 |  |  |  | 9,241,750 |  |  |  | 9,265,928 |  |  |  | 9,241,750 |
Less: average unvested restricted shares (1) |  |  | (92,368 | ) |  |  | (86,300 | ) |  |  | (92,398 | ) |  |  | (86,300 | )
Weighted average common shares outstanding (1) |  |  | 9,173,530 |  |  |  | 9,155,450 |  |  |  | 9,173,530 |  |  |  | 9,155,450 |
Basic earnings and diluted per share (1) |  | $ | 0.44 |  |  | $ | 0.35 |  |  | $ | 0.85 |  |  | $ | 0.66 |
| (1) | Share data has been adjusted to reflect a 2-for-1 stock split on September 20, 2017

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