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Note 4 - Investment 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, 2023 | Mar. 31, 2022
Prudential Investment Program [Member] |  |
Income of joint ventures, net | $ 9,800 | $ 2,400
KIR [Member] |  |
Income of joint ventures, net | 9,300 | 13,400
CPP [Member] |  |
Income of joint ventures, net | 2,700 | 3,100
Other Institutional Joint Ventures [Member] |  |
Income of joint ventures, net | 700 | 1,500
Other Joint Venture Programs [Member] |  |
Income of joint ventures, net | 1,700 | 3,200
Joint Ventures [Member] |  |
Income of joint ventures, net | $ 24,204 | $ 23,570

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