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(6) Earnings Per Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share, Basic and Diluted [Abstract] |
(6) Earnings Per Share | (6) Earnings Per Share Earnings per share for the three-month and nine-month periods ended September 30, 2021 and 2020 were calculated using the weighted average number of shares outstanding for the related period. The following table reconciles the number of shares used in the computations of basic and diluted earnings per share for the three-month and nine-month periods ended September 30, 2021 and 2020:
Computation of earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | (In thousands) |  |  | (In thousands) |
Weighted average number of common shares outstanding during the period used to compute basic earnings per share |  |  | 23,011 |  |  |  | 22,666 |  |  |  | 22,866 |  |  |  | 22,630 |
Incremental common shares attributable to exercise of outstanding options and warrants |  |  | 3,207 |  |  |  | 1,242 |  |  |  | 2,573 |  |  |  | 1,195 |
Weighted average number of common shares used to compute diluted earnings per share |  |  | 26,218 |  |  |  | 23,908 |  |  |  | 25,439 |  |  |  | 23,825 |
If the anti-dilutive effects of common stock equivalents were considered, shares included in the diluted earnings per share calculation for the three-month and nine-month periods ended September 30, 2021 would have included an additional 5.6 million and 5.8 million shares, respectively, attributable to the exercise of outstanding options and warrants. For the three-month and nine-month periods ended September 30, 2020, an additional 14.2 million and 13.5 million shares, respectively, would be included in the diluted earnings per share calculation.

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