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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Net Income Per Share | Net income per share calculation information is as follows:
|  | Year ended December 31, |
|  | 2017 |  |  | 2018 |
Net income |  | $ | 87,131,169 |  |  | $ | 6,481,049 |
Weighted-average shares outstanding: |  |  |  |  |  |  |  |
Basic |  |  | 27,696,790 |  |  |  | 27,444,110 |
Effect of dilutive restricted stock |  |  | 95,912 |  |  |  | 89,873 |
Diluted |  |  | 27,792,702 |  |  |  | 27,533,983 |
Net income per Class A and Class B common share - basic |  | $ | 3.15 |  |  | $ | 0.24 |
Net income per Class A and Class B common share - diluted |  | $ | 3.14 |  |  | $ | 0.24 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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