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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Prudential Investment Program [Member] |  |  |  |
Income of joint ventures, net | $ 3,400 | $ 2,600 | $ 15,400 | $ 7,400
KIR [Member] |  |  |  |
Income of joint ventures, net | 8,200 | 17,500 | 26,000 | 62,900
CPP [Member] |  |  |  |
Income of joint ventures, net | 1,500 | 2,500 | 6,900 | 8,200
Other Institutional Joint Ventures [Member] |  |  |  |
Income of joint ventures, net | 700 | 800 | 2,200 | 6,300
Other Joint Venture Programs [Member] |  |  |  |
Income of joint ventures, net | 2,500 | 3,000 | 7,100 | 9,300
Joint Ventures [Member] |  |  |  |
Income of joint ventures, net | $ 16,257 | $ 26,360 | $ 57,589 | $ 94,060

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