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Note 4 - Real Estate Under Development (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020
Development in Process				$ 229,900,000
Real Estate Inventory, Capitalized Interest Costs, Ending Balance				$ 31,200,000
Real Estate Investment Property, Net, Total	$ 9,346,041,000	$ 9,209,053,000
Other Assets, Total	97,225,000	194,682,000
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold	30,764,579	307,607,731	$ 836,988,450
Total Net Gain Loss on Sale of Operating Properties	6,484,000	79,218,000	$ 229,840,000
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
Reclassification from Development in Process to Operating Real Estate [Member]
Real Estate Investment Property, Net, Total	228,800,000
Reclassification from Development in Process to Other Assets [Member]
Other Assets, Total	$ 1,100,000

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Total gain/loss on sale of operating properties and change in control gain, net of tax.

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The current amount of expenditures for a real estate project that has not yet been completed.

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Amount of assets classified as other.

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Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

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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.

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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.

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