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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income of joint ventures, net	$ 13,200	$ 108,700	$ 27,902	$ 178,618
Kim Pru and Kim Pru II [Member]
Income of joint ventures, net	3,200	3,100	6,500	5,300
KIR [Member]
Income of joint ventures, net	7,200	12,100	16,600	19,500
CPP [Member]
Income of joint ventures, net	1,300	900	2,900	4,800
Other Joint Venture Programs [Member]
Income of joint ventures, net	$ 1,500	$ 92,600	$ 1,900	$ 149,000