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Note 10 - Notes and Mortgages Payable (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 23, 2018 | Jul. 26, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Repayments of Unsecured Debt |  |  |  | $ 6,365 | $ 250,000
Senior Unsecured Notes 1 [Member] |  |  |  |  |
Repayments of Unsecured Debt |  |  | $ 6,400 |  |
Debt Instrument, Face Amount |  |  | $ 500,000 | $ 500,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.20% | 3.20% |
Unsecured Debt, Total |  |  | $ 493,600 | $ 493,600 |
Senior Unsecured Notes 2 [Member] | Scenario, Forecast [Member] |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 100.00% |  |  |  |
Senior Unsecured Notes 2 [Member] | Scenario, Forecast [Member] | Treasury Rate [Member] |  |  |  |  |
Debt Instrument Redemption Basis Spread on Discount Rate | 0.50% |  |  |  |
Senior Unsecured Notes 2 [Member] | Subsequent Event [Member] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.875% |  |  |
Unsecured Debt Called for Redemption |  | $ 300,000 |  |  |
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member] |  |  |  |  |
Debt Instrument, Increase (Decrease), Net, Total |  |  |  | 206,000 |
Repayments of Long-term Debt, Total |  |  |  | 176,000 |
Liabilities, Fair Value Adjustment |  |  |  | 800 |
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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- Definition Net increase or decrease in the carrying amount of the debt instrument for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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