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Note 5 - Other Investments (Details Textual)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Preferred Equity Investments [Member]    
Equity Method Investments $ 74.2  
Number of Real Estate Properties 21  
Income (Loss) from Equity Method Investments, Total $ 5.9 $ 3.2
Investment With Funding Commitments [Member]    
Equity Method Investment, Commitment Amount 25.0  
Payments to Acquire Equity Method Investments $ 9.4