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Summary of Significant Accounting Policies (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Noncontrolling Interest, Ownership Percentage By Parent | 97.05% | 96.59% | 97.05% | 96.59% |
Estimated Current Market Interest Rate |  |  | 3.76% | 4.87% |
Amortization |  |  | $ 1,712,530 | $ 1,105,087 | $ 409,920
Common Stock, Dividends, Per Share, Declared | $ 0.40 | $ 0.40 | $ 1.60 | $ 1.60 | $ 2.04
Real Estate, Federal Income Tax Basis | $ 18,700,000 |  | $ 18,700,000 |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life |  |  | 19 years 10 months 24 days |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 20 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 40 years |  |
Equipment and Fixtures [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 5 years |  |
Equipment and Fixtures [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |

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