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Note 5 - 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, 2024 | Mar. 31, 2023
Prudential Investment Program [Member] |  |
Income of joint ventures, net | $ 2,300 | $ 9,800
KIR [Member] |  |
Income of joint ventures, net | 9,700 | 9,300
R2G Venture LLC [Member] |  |
Income of joint ventures, net | 1,700 | 0
CPP [Member] |  |
Income of joint ventures, net | 2,100 | 2,700
Other Institutional Joint Ventures [Member] |  |
Income of joint ventures, net | 1,400 | 700
Other Joint Venture Programs [Member] |  |
Income of joint ventures, net | 3,700 | 1,700
Joint Ventures [Member] |  |
Income of joint ventures, net | $ 20,905 | $ 24,204

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