Note 4 - Investments and Advances in Real Estate Joint Ventures - The Company's Share of Net Income/(Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Kim Pru and Kim Pru II [Member]
Equity in income of joint ventures, net	[1],[2]	$ 2,200	$ (200)	$ 7,500	$ 3,300
KIR [Member]
Equity in income of joint ventures, net	[1]	7,900	8,500	27,400	31,600
CPP [Member]
Equity in income of joint ventures, net	[1]	1,300	2,200	6,200	7,100
Other Institutional Programs [Member]
Equity in income of joint ventures, net	[1]	300	300	900	1,500
Other Joint Venture Programs [Member]
Equity in income of joint ventures, net	[1],[3],[4],[5]	(1,600)	(4,700)	2,700	12,200
Canadian Properties [Member]
Equity in income of joint ventures, net	[1]	1,400	4,800	145,500	75,100
Equity in income of joint ventures, net		$ 11,500	$ 10,900	$ 190,155	$ 130,808

[1] Amounts include impairments and gains on sale of real estate properties and ownership interests in joint ventures, see table below.

[2] During the nine months ended September 30, 2016 and 2015, KimPru recognized impairment charges related to the pending disposition of one and three operating properties, respectively, of which the Company's share of these impairment charges were $0.8 million and $2.8 million, respectively.

[3] During 2013, the Intown portfolio was sold and the Company maintained its guarantee on a portion of debt that was assumed by the buyer at closing. The transaction resulted in a deferred gain to the Company of $21.7 million due to the Company’s continued involvement through its guarantee of the debt. On February 24, 2015, the outstanding debt balance was fully repaid by the buyer and as such, the Company was relieved of its related commitments and guarantee. As a result, the Company recognized the deferred gain of $21.7 million during the nine months ended September 30, 2015.

[4] During the nine months ended September 30, 2015, three joint ventures in which the Company holds noncontrolling interests recognized impairment charges relating to the pending sale of two properties and the pending foreclosure of one property. The Company’s share of these impairment charges was $9.8 million, before income tax benefit.

[5] During the nine months ended September 30, 2016, a joint venture recognized an impairment charge related to the pending sale of a property, of which the Company’s share was $2.4 million.