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Subsequent Events (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Proceeds From Issuance Of Common Stock |  |  | $ 35,042,235 | $ 0 | $ 31,072,752
Common Stock, Dividends, Per Share, Declared | $ 0.40 | $ 0.40 | $ 1.60 | $ 1.60 | $ 2.04
Subsequent Event [Member] |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period |  |  | 225,000 |  |
Proceeds From Issuance Of Common Stock |  |  | $ 44,900,000 |  |
Common Stock, Dividends, Per Share, Declared |  |  | $ 0.41 |  |
Plan 2005 [Member] | Subsequent Event [Member] |  |  |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period |  |  | 82,050 |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Period |  |  | 5 years |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,725,000 |  |

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