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Note 6 - Investments in and Advances to Unconsolidated Joint Ventures (Details Textual)
$ in Thousands
3 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
Equity Method Investment, Ownership Interests in Unconsolidated Joint Ventures   10   10
Equity Method Investment, Interest Capitalized   $ 800    
Income (Loss) from Equity Method Investments, Total   (1,937) $ 184  
Revenue from Contract with Customer, Including Assessed Tax   132,033 118,848  
Management Service [Member]        
Revenue from Contract with Customer, Including Assessed Tax   400 500  
Unconsolidated Joint Ventures [Member]        
Equity Method Investment, Other than Temporary Impairment   2,300 $ 0  
Income (Loss) from Equity Method Investments, Total   $ (2,200)    
Unconsolidated Joint Ventures [Member] | Forecast [Member]        
Proceeds from Sale of Equity Method Investments $ 5,100      
Minimum [Member] | Unconsolidated Joint Ventures [Member]        
Equity Method Investment, Ownership Percentage   5.00%   5.00%
Maximum [Member] | Unconsolidated Joint Ventures [Member]        
Equity Method Investment, Ownership Percentage   35.00%   35.00%