Note 4 - Investments in and Advances to Real Estate Joint Ventures - The Company's Share of Net Income/(Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income of joint ventures, net		$ 9,100	$ 11,500	$ 37,044	$ 190,155
Kim Pru and Kim Pru II [Member]
Income of joint ventures, net		3,200	2,200	9,700	7,500
KIR [Member]
Income of joint ventures, net		8,200	7,900	24,700	27,400
CPP [Member]
Income of joint ventures, net		1,300	1,300	4,300	6,200
Other Joint Venture Programs [Member]
Income of joint ventures, net	[1]	$ (3,600)	$ 100	$ (1,700)	$ 149,100

[1] During the three and nine months ended September 30, 2017, the Company recognized a cumulative foreign currency translation loss of $4.8 million as a result of the substantial liquidation of the Company's investments in Canada during 2017.