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Note 5 - Real Estate Assets Held for Sale (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Real Estate Portfolio [Member]    
Income, Real Estate Assets Held for Sale $ 0 $ 2,396
Minimum [Member]    
Limited Partner Equity Interest in Real Estate Portfolio 1.00%  
Maximum [Member]    
Limited Partner Equity Interest in Real Estate Portfolio 2.00%