Note 13 - Mortgages and Construction Loan Payable (Details Textual) $ in Millions	1 Months Ended	12 Months Ended
Aug. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Long-term Debt, Total		$ 4,381.5	$ 4,596.1
Gain (Loss) on Forgiveness of Debt		4.3
Accrued Interest Extinguished		$ 3.4
Construction Loans [Member]
Debt Instrument, Commitment	$ 67.0
Debt Instrument, Interest Rate, Effective Percentage		4.23%
Long-term Debt, Total		$ 51.0
Construction Loans [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.80%
Mortgages [Member]
Long-term Debt, Total		492.4	882.8
Deconsolidation of Mortgage Loans		206.0
Long-term Debt, Fair Value		13.1	19.3
Real Estate Disposed of Through Foreclosure		12.4
Mortgages [Member] \| Encumbered Operating Properties [Member]
Repayments of Long-term Debt, Total		205.6	692.9
Long-term Debt, Fair Value		$ 0.9	$ 5.8
Number of Real Estate Properties		6	27
Mortgages [Member] \| Operating Properties [Member]
Long-term Debt, Fair Value			$ 8.5
Number of Real Estate Properties			2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 257.5
Mortgages [Member] \| Operating Properties [Member] \| Acquired [Member]
Number of Real Estate Properties			1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 206.0

The amount of accrued interest extinguished.

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The amount of debt instrument that has been committed under a certain agreement.

+ References

No definition available.

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The amount of mortgage loans deconsolidated.

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The amount of gain (loss) on forgiveness of debt.

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Carrying amount as of the balance sheet date of land and buildings disposed of through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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No definition available.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The number of real estate properties owned as of the balance sheet date.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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