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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Computation for earnings per share |
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Net income |  | $ | 16,930,892 |  |  | $ | 14,352,968 |  |  | $ | 12,402,441 |
Weighted average number of outstanding shares |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 3,111,328 |  |  |  | 2,951,751 |  |  |  | 2,766,741 |
Diluted |  |  | 3,111,328 |  |  |  | 2,951,751 |  |  |  | 2,767,895 |
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 5.44 |  |  |  | 4.86 |  |  |  | 4.48 |
Diluted |  | $ | 5.44 |  |  |  | 4.86 |  |  |  | 4.48 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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