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Earnings per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | A reconciliation of the numerators and denominators of the basic earnings per common share and diluted earnings per common share computations for 2017 and 2016 is presented below.
|  | 2017 |  | 2016 |
Basic earnings per common share: |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 8,960,766 |  | $ | 9,141,725 |
Weighted-average common shares outstanding |  |  | 2,863,899 |  |  | 2,858,556 |
Basic earnings per common share |  | $ | 3.13 |  | $ | 3.20 |
Diluted earnings per common share: |  |  |  |  |  |  |
Net income available to common stockholders |  | $ | 8,960,766 |  | $ | 9,141,725 |
Weighted-average common shares outstanding |  |  | 2,863,899 |  |  | 2,858,556 |
Weighted-average common and dilutive potential common shares outstanding |  |  | 2,864,037 |  |  | 2,858,601 |
Diluted earnings per common share |  | $ | 3.13 |  | $ | 3.20 |

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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://www.xbrl.org/2003/role/presentationRef -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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