Note 7 - Investment in and Advances to Real Estate Joint Ventures - The Company's Share of Net Income/(Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income of joint ventures, net		$ 71,617	$ 60,763	$ 218,714
Kim Pru and Kim Pru II [Member]
Income of joint ventures, net		15,200	13,000	16,400
KIR [Member]
Income of joint ventures, net		38,700	36,700	44,000
CPP [Member]
Income of joint ventures, net		5,100	7,200	7,700
Other Joint Venture Programs [Member]
Income of joint ventures, net	[1],[2],[3],[4]	$ 12,600	$ 3,900	$ 150,600

[1] During the year ended December 31, 2017, a joint venture recognized an impairment charge related to the pending sale of a property, of which the Company's share was $3.4 million.

[2] During the year ended December 31, 2017, the Company recognized a cumulative foreign currency translation loss of $4.8 million due to the substantial liquidation of the Company's investments in Canada during 2017.

[3] During the year ended December 31, 2018, a joint venture investment distributed cash proceeds resulting from the refinancing of an existing loan of which the Company's share was $3.6 million. This distribution was in excess of the Company's carrying basis in this joint venture investment and to that extent was recognized as income.

[4] During the year ended December 31, 2018, a joint venture recognized an impairment charge related to the pending foreclosure of a property, of which the Company's shares was $5.2 million.