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Net Income Per Share (Tables) | 6 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Share | The following table presents shares used in the calculation of basic and diluted net income per share:
| Three Months Ended |  |  | Six Months Ended |
| March 31, |  |  | March 31, |
| 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |
Weighted average common shares outstanding used in calculating basic income per share |  | 21,520,215 |  |  |  | 22,143,043 |  |  |  | 21,486,995 |  |  |  | 22,083,827 |
Effect of dilutive options and non-vested restricted stock awards |  | 440,070 |  |  |  | 843,018 |  |  |  | 438,110 |  |  |  | 781,123 |
Weighted average common and common equivalent shares used in calculating diluted income per share |  | 21,960,285 |  |  |  | 22,986,061 |  |  |  | 21,925,105 |  |  |  | 22,864,950 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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