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Note 3 - Discontinued Operations (Detail) (USD $) | Mar. 31, 2013 sqft | Dec. 31, 2012
--- | --- | ---
(in Square Feet) | 1,063,000 | [1] |
Real Estate Investment Property, Accumulated Depreciation | $ 1,801,679,000 |  | $ 1,745,462,000
Fair Value Of Real Estate | 14,706,000 |  | 52,505,000
Assets Held-for-sale [Member] | Operating Properties [Member] |  |  |
Number of Real Estate Properties | 1 |  |
Assets Held-for-sale [Member] | Remaining [Member] |  |  |
Real Estate Held-for-sale | 200,000 |  |
Real Estate Investment Property, Accumulated Depreciation | 900,000 |  |
Assets Held-for-sale [Member] |  |  |
(in Square Feet) | 14,600 |  |
Fair Value Of Real Estate | $ 200,000 |  |
Operating Properties [Member] | Sold [Member] |  |  |
Number of Real Estate Properties | 1 |  |
[1] | Gross leasable area ("GLA")

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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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