Note 10 - Noncontrolling Interests (Details Textual) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Payments to Noncontrolling Interests	$ 2.7	$ 3.4
Adjustments to Additional Paid in Capital, Other	0.5	1.2
Gain on Sale of Operating Properties/ Change in Controls of Interests [Member] \| Accounting Standards Update 2017-05 [Member]
Deconsolidation, Gain (Loss), Amount		6.8
Sold Portion of Investment in Consolidated Operating Property [Member]
Noncontrolling Interest, Decrease from Deconsolidation		43.8
Land Parcel Adjacent to Shopping Center Located in Ardmore, PA [Member]
Disposal Group, Including Discontinued Operation, Consideration		320.0
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member]
Debt Instrument, Increase (Decrease), Net, Total		206.0
Noncontrolling Interest [Member]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	$ 3.2	$ 4.6

Amount of other increase (decrease) in additional paid in capital (APIC).

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Net increase or decrease in the carrying amount of the debt instrument for the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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