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Note 3 - Real Estate (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Property Subject to or Available for Operating Lease [Table Text Block] |
|  | December 31, |
|  | 2012 |  |  | 2011 |
Land |  | $ | 1,927,800 |  |  | $ | 1,847,770 |
Undeveloped land |  |  | 96,500 |  |  |  | 97,275 |
Buildings and improvements: |  |  |  |  |  |  |  |
Buildings |  |  | 4,607,931 |  |  |  | 4,513,339 |
Building improvements |  |  | 1,091,810 |  |  |  | 1,024,514 |
Tenant improvements |  |  | 708,626 |  |  |  | 715,951 |
Fixtures and leasehold improvements |  |  | 59,690 |  |  |  | 56,827 |
Other rental property (1) |  |  | 357,667 |  |  |  | 335,859 |
|  |  | 8,850,024 |  |  |  | 8,591,535 |
Accumulated depreciation and amortization |  |  | (1,745,462 | ) |  |  | (1,693,090 | )
Total |  | $ | 7,104,562 |  |  | $ | 6,898,445 |

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- Definition Tabular disclosure of lessor's property under leasing agreements and property available for lease (not currently under lease) by property class, the gross amount, accumulated depreciation and net amount of as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 23 -Subparagraph b(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration