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Note 5 - Investments In and Advances to Real Estate Joint Ventures (Details Textual) ft² in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) ft² | Jun. 30, 2018 USD ($) | Dec. 31, 2018 ft²
Gross Leasable Area | ft² |  | 125 |  |
Proceeds from Equity Method Investment, Distribution |  | $ 60,858 | $ 67,005 |
All Equity Method Investments [Member] |  |  |  |
Number of Real Estate Properties |  | 104 |  | 109
Gross Leasable Area | ft² |  | 22,200 |  | 23,200
Kim Pru and Kim Pru II [Member] |  |  |  |
Number of Joint Ventures |  | 4 |  |
Number Of Accounts |  | 4 |  |
Kim Pru [Member] |  |  |  |
Number of Joint Ventures |  | 3 |  |
Other Joint Venture Programs [Member] |  |  |  |
Proceeds from Equity Method Investment, Distribution | $ 3,600 |  |  |
Real Estate Joint Ventures [Member] | Operating Properties [Member] |  |  |  |
Number of Real Estate Properties, Interest Disposed of or Transferred |  | 5 | 4 |
Equity Method Investment, Sales Price | $ 37,900 | $ 128,200 | $ 37,900 |
Impairment of Long-Lived Assets to be Disposed of |  | $ 11,900 | $ 3,500 |

X
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- Definition The amount of floor space available to be rented in a commercial property. + References No definition available. + Details
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- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=118932676&loc=SL94080555-108585 + Details
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