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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
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Mar. 31, 2020 | Mar. 31, 2019
Prudential Investment Program [Member] |  |
Income of joint ventures, net | $ 2,600 | $ 2,900
KIR [Member] |  |
Income of joint ventures, net | 9,800 | 14,500
CPP [Member] |  |
Income of joint ventures, net | 1,000 | 1,400
Other Joint Venture Programs [Member] |  |
Income of joint ventures, net | 200 | 0
Joint Ventures [Member] |  |
Income of joint ventures, net | $ 13,648 | $ 18,754

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