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Note 4 - Real Estate Under Development (Details Textual) | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Real Estate Under Development, Capitalized Costs of Interest, Real Estate Taxes, Insurance, Legal Costs and Payroll | $ 21,300,000 | $ 24,900,000 |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold | 190,859,948 | 767,246,512 | $ 315,954,464
Total Net Gain Loss on Sale of Operating Properties | 79,218,000 | 229,840,000 | $ 93,538,000
Real Estate Investment Property, Net, Total | 9,209,053,000 | 9,250,519,000 |
Impairment of Real Estate | 48,700,000 | 79,200,000 |
Real Estate Inventory, Capitalized Interest Costs Incurred | 9,400,000 | 13,900,000 |
Real Estate Development Projects, Real Estate Taxes and Insurance Capitalized | 1,300,000 | 2,600,000 |
Real Estate Development Projects, Payroll Costs Capitalized | 1,200,000 | $ 1,900,000 |
Dania Pointe [Member] |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold | 32,500,000 |  |
Total Net Gain Loss on Sale of Operating Properties | 4,300,000 |  |
Mill Station [Member] |  |  |
Real Estate Investment Property, Net, Total | 80,500,000 |  |
Real Estate Inventory, Capitalized Interest Costs, Ending Balance | 9,200,000 |  |
Promenade at Christiana [Member] |  |  |
Impairment of Real Estate | $ 11,500,000 |  |
Real Estate Under Development [Member] |  |  |
Number of Real Estate Properties | 2,018 |  |

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- Definition The amount of real estate taxes and insurance from real estate development projects that has been capitalized. + References No definition available. + Details
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- Definition Represents capitalized costs of interest, real estate taxes, insurance, legal costs and payroll related to real estate under development. + References No definition available. + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- Definition Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Carrying amount as of the balance sheet date of interest costs that were capitalized to properties under development during the land development and construction period of a project, and which are included in inventory. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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