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Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Detail) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Reconciliation to Consolidated Balance Sheet at December 31, 2013 | ||||
| Income Properties: Land Buildings, and Improvements | $ 154,902,374 | $ 132,202,887 | ||
| Total | 170,194,285 | |||
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Real Estate [Member]
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| Reconciliation to Consolidated Balance Sheet at December 31, 2013 | ||||
| Land, Timber, and Subsurface Interests | 15,291,911 | |||
| Income Properties: Land Buildings, and Improvements | 154,902,374 | |||
| Land Timber Subsurface Interests and Income Properties | 170,194,285 | |||
| Cost Basis of Assets Classified as Held for Sale on Balance Sheet | ||||
| Total | $ 170,194,285 | $ 151,226,811 | $ 134,561,058 | $ 134,705,516 |