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Note 6 - Investments in and Advances to Unconsolidated Joint Ventures (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Equity Method Investment, Ownership Interests in Unconsolidated Joint Ventures 10       10 10 10
Equity Method Investment Basis Difference           $ 2,500  
Equity Method Investment, Impairment of Joint Ventures         $ 0 70,000 $ 28,776
Equity Method Investment, Impairment of Joint Venture Allocated to Company         0 3,500 18,900
Income (Loss) from Equity Method Investments, Total         (18,791) (3,503) (19,653)
Revenue from Contract with Customer, Including Assessed Tax         507,411 669,349 667,566
Management Service [Member]              
Revenue from Contract with Customer, Including Assessed Tax         900 1,900 3,400
Unconsolidated Joint Ventures [Member]              
Equity Method Investment, Other than Temporary Impairment     $ 20,000 $ 2,300 $ 22,300 $ 0 $ 1,100
Income (Loss) from Equity Method Investments, Total $ 4,500            
Proceeds from Sale of Equity Method Investments   $ 5,100          
Bedford [Member]              
Equity Method Investment, Other than Temporary Impairment       $ 2,300      
Minimum [Member] | Unconsolidated Joint Ventures [Member]              
Equity Method Investment, Ownership Percentage 10.00%       10.00%    
Maximum [Member] | Unconsolidated Joint Ventures [Member]              
Equity Method Investment, Ownership Percentage 35.00%       35.00%