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Note 7 - Investments In and Advances to Real Estate Joint Ventures - The Company's Share of Net Income/(Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Prudential Investment Program [Member] |  |  |  |
Income of joint ventures, net | [1] | $ 17,500 | $ 9,000 | $ 10,400
KIR [Member] |  |  |  |
Income of joint ventures, net |  | 36,900 | 30,500 | 50,300
CPP [Member] |  |  |  |
Income of joint ventures, net |  | 9,200 | 5,600 | 5,800
Other Institutional Joint Ventures [Member] |  |  |  |
Income of joint ventures, net |  | 1,700 | 0 | 0
Other Joint Venture Programs [Member] |  |  |  |
Income of joint ventures, net |  | 19,500 | 2,300 | 5,700
Joint Ventures [Member] |  |  |  |
Income of joint ventures, net |  | $ 84,778 | $ 47,353 | $ 72,162
[1] | During the year ended December 31, 2019, the Prudential Investment Program recognized an impairment charge on a property of $29.9 million, of which the Company’s share was $3.7 million.

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