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Note 2 - Real Estate (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Property Subject to or Available for Operating Lease [Table Text Block] |
|  | December 31, |
|  | 201 7 |  |  | 201 6 |
Land |  | $ | 2,971,020 |  |  | $ | 2,786,255 |
Undeveloped land |  |  | 48,264 |  |  |  | 58,931 |
Buildings and improvements: |  |  |  |  |  |  |  |
Buildings |  |  | 6,047,413 |  |  |  | 5,790,681 |
Building improvements |  |  | 1,653,581 |  |  |  | 1,562,439 |
Tenant improvements |  |  | 753,501 |  |  |  | 733,993 |
Fixtures and leasehold improvements |  |  | 45,795 |  |  |  | 47,199 |
Above -market leases |  |  | 153,484 |  |  |  | 150,207 |
In- place leases and tenant relationships |  |  | 577,870 |  |  |  | 543,342 |
|  |  | 12,250,928 |  |  |  | 11,673,047 |
Accumulated depreciation and amortization (1) |  |  | (2,433,053 | ) |  |  | (2,278,292 | )
Total |  | $ | 9,817,875 |  |  | $ | 9,394,755 |
Above and Below Market Lease Tenant Relationships Future Amortization Income Expense [Table Text Block] |
|  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 202 1 |  |  | 202 2 |
Above -market and below-market leases amortization, net |  | $ | 13.2 |  |  | $ | 14.0 |  |  | $ | 14.1 |  |  | $ | 14.3 |  |  | $ | 13.4 |
In-place leases and t enant relationships amortization |  | $ | (43.7 | ) |  | $ | (34.6 | ) |  | $ | (26.5 | ) |  | $ | (20.7 | ) |  | $ | (15.9 | )

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- Definition Tabular disclosure of the amount of amortization income (expense) expected to be recorded in succeeding fiscal years for leases acquired as part of a real property acquisition at above and below market lease rate with a finite life. As well as amortization expense of tenant relationships and leases in place. + References No definition available. + Details
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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=84164653&loc=d3e41551-112718 + Details
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