Note 5 - Investment in and Advances to Real Estate Joint Ventures - The Company's Share of Net Income/(Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Kim Pru and Kim Pru II [Member]
Income of joint ventures, net	$ 2,900	$ 2,900
KIR [Member]
Income of joint ventures, net	14,500	9,000
CPP [Member]
Income of joint ventures, net	1,400	1,200
Other Joint Venture Programs [Member]
Income of joint ventures, net		3,800
Joint Ventures [Member]
Income of joint ventures, net	$ 18,754	$ 16,913