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Note 10 - Notes, Mortgages and Construction Loan Payable (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Gain (Loss) on Extinguishment of Debt, Total |  | $ (12,762) | $ (1,753) | $ (12,762) | $ (1,753) |
Notes Payable, Total |  | 4,409,500 |  | 4,409,500 |  | $ 4,596,140
Senior Unsecured Note [Member] |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  | (12,800) |  |
Notes Payable, Total |  | $ 484,900 |  | 484,900 |  |
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member] |  |  |  |  |  |
Debt Instrument, Increase (Decrease), Net, Total |  |  |  | 206,000 |  |
Repayments of Long-term Debt, Total |  |  |  | 203,600 |  |
Liabilities, Fair Value Adjustment |  |  |  | $ 900 |  |
Construction Loan [Member] |  |  |  |  |  |
Debt Instrument, Commitment | $ 67,000 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.96% |  | 3.96% |  |
Long-term Debt, Total |  | $ 30,400 |  | $ 30,400 |  |
Construction Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.80% |  |  |  |  |
Mortgages [Member] |  |  |  |  |  |
Debt Instrument, Increase (Decrease), Net, Total |  |  |  | 12,400 |  |
Mortgages [Member] | Other Income (Expense), Net [Member] |  |  |  |  |  |
Gain on Forgiveness of Debt |  |  |  | 4,300 |  |
Relief of Accrued Interest |  |  |  | $ 3,400 |  |

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