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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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