Note 2 - Operating Property Activities (Details) (USD $)	3 Months Ended		6 Months Ended							6 Months Ended															1 Months Ended	6 Months Ended					6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jul. 31, 2013	Mar. 31, 2013	Jun. 30, 2013 Acquisitions [Member] Santee Trolley Square [Member]	Jun. 30, 2013 Acquisitions [Member] Shops at Kildeer [Member]	Jun. 30, 2013 Acquisitions [Member] Putty Hill Plaza [Member]	Jun. 30, 2013 Operating Properties [Member]	Jun. 30, 2013 Two Land Parcels [Member]	Jun. 30, 2013 Two Land Parcels and Four Operating Properties [Member]	Jun. 30, 2013 Cost-method Investments [Member]	Jun. 30, 2013 Santee Trolley Square [Member]		Jun. 30, 2013 Shops at Kildeer [Member]		Jun. 30, 2013 Putty Hill Plaza [Member]		Jun. 30, 2013 Wilton River Park [Member] Convertible Debt [Member]	Jun. 30, 2013 Wilton River Park [Member]		Jun. 30, 2013 Canyon Square [Member]		Apr. 30, 2013 JTS Portfolio [Member]	Jun. 30, 2013 JTS Portfolio [Member]		Jun. 30, 2013 Factoria Mall [Member]		Dec. 31, 2012 Factoria Mall [Member]	Jun. 30, 2013 FNC Realty Corporation [Member]	Jun. 30, 2013 Three Joint Ventures [Member]	Jun. 30, 2013 Property, Plant and Equipment [Member]	Jun. 30, 2013 Convertible Debt [Member]
Note 2 - Operating Property Activities (Details) [Line Items]
Equity Method Investment, Ownership Percentage							45.00%	19.00%																							100.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (in Dollars)	$ (1,459,000)	$ 12,147,000	$ 21,711,000	$ 14,156,000										$ 22,700,000				$ 500,000										$ 8,200,000
Noncontrolling Interest, Ownership Percentage by Parent									80.00%																					50.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									20.00%														15.00%
Business Combination, Consideration Transferred, Liabilities Incurred			239,362,000											48,456,000	[1]	32,724,000	[2]	9,115,000	[3]	5,200,000	36,000,000	[4]	13,800,000	[5]		43,267,000	[6]	56,000,000	[7]
Debt Instrument, Convertible, Term																																		1 year
Debt Instrument, Interest Rate, Stated Percentage	4.70%		4.70%		3.855%	6.125%															6.50%													6.00%
Loans Receivable, Net																					5,200,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss																										9,600,000
Repayments of Debt																									43,300,000
Additional Interest Acquired, Percentage																												49.00%			17.30%
Payments to Acquire Businesses, Gross			118,561,000											26,863,000	[1]		[2]	4,592,000	[3]		777,000	[4]	1,950,000	[5]			[6]	37,283,000	[7]		20,300,000	6,500,000
Noncontrolling Interest, Period Increase (Decrease)																															(19,600,000)	(400,000)
Adjustments to Additional Paid in Capital, Other			(4,800,000)																												(700,000)
Sales of Real Estate										100,800,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	1,869,000	11,263,000	4,365,000	23,242,000						4,400,000
Impairment of Real Estate			81,500,000	34,600,000						20,800,000	300,000		7,800,000
Proceeds from Sale of Real Estate											10,900,000
Asset Impairment Charges			81,546,000	34,570,000																													35,500,000
Payments to Acquire Real Estate			145,303,000	267,427,000								39,500,000
Cost Method Investments, Fair Value Disclosure													$ 7,000,000

[1] This property was acquired from a joint venture in which the Company had a 45% noncontrolling interest. The Company evaluated this transaction pursuant to the FASB's Consolidation guidance and as such recognized a gain of $22.7 million, before income tax, from the fair value adjustment associated with the Company's original ownership due to a change in control, which is reflected in the purchase price above in Other.

[2] This property was acquired from a joint venture in which the Company had a 19% noncontrolling interest. The Company evaluated this transaction pursuant to the FASB's Consolidation guidance. This transaction resulted in a change in control with no gain or loss recognized.

[3] The Company acquired the remaining 80% interest in an operating property from an unconsolidated joint venture in which the Company had a 20% noncontrolling interest. The Company evaluated this transaction pursuant to the FASB's Consolidation guidance and as such recognized a gain of $0.5 million from the fair value adjustment associated with the Company's original ownership due to a change in control, which is reflected in the purchase price above in Other.

[4] The acquisition of this property included the issuance of $5.2 million of redeemable units, which are redeemable at the option of the holder after one year and earn a yield of 6% per annum, which is included in the purchase price above in Other. In connection with this transaction, the Company provided the sellers a $5.2 million loan at a rate of 6.5%, which is secured by the redeemable units.

[5] This property was acquired from a joint venture in which the Company has a 15% noncontrolling interest. The Company evaluated this transaction pursuant to the FASB's Consolidation guidance. This transaction resulted in a change in control with no gain or loss recognized.

[6] The Company acquired the remaining interest in a portfolio of office properties from a preferred equity investment in which the Company held a noncontrolling interest. The Company evaluated this transaction pursuant to the FASB's Consolidation guidance and as such recognized a change in control loss of $9.6 million from the fair value adjustment associated with the Company's original ownership, which is reflected in the purchase price above in Other. The debt assumed in connection with this transaction of $43.3 million was repaid in April 2013.

[7] The Company acquired an additional 49% interest in this operating property from an unconsolidated joint venture in which the Company had a 50% noncontrolling interest. As such the Company now consolidates this investment. The Company evaluated this transaction pursuant to the FASB's Consolidation guidance and as a result, recognized a gain of $8.2 million from the fair value adjustment associated with the Company's original ownership due to a change in control, which is reflected in the purchase price above in Other.