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Note 6 - Investments in and Advances to Unconsolidated Joint Ventures (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 23, 2017
USD ($)
Aug. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Equity Method Investment, Ownership Interests in Unconsolidated Joint Ventures         10 10 10  
Equity Method Investment, Interest Capitalized         $ 2,500,000      
Equity Method Investment, Impairment of Joint Ventures         70,000,000.0 $ 28,776,000 $ 0  
Equity Method Investment, Impairment of Unconsolidated Entity Investments         3,500,000 18,900,000 0  
Revenue from Contract with Customer, Including Assessed Tax         669,349,000 667,566,000 751,166,000  
Payments to Acquire Interest in Joint Venture         8,826,000 15,066,000 27,479,000  
Proceeds from (Repayments of) Notes Payable, Total         0 0 (4,110,000)  
Income (Loss) from Equity Method Investments, Total         (3,503,000) (19,653,000) 866,000  
Management Service [Member]                
Revenue from Contract with Customer, Including Assessed Tax         1,947,000 3,385,000 4,945,000  
Unconsolidated Joint Ventures [Member]                
Equity Method Investment, Other than Temporary Impairment         $ 0 $ 1,100,000 0  
Tidelands [Member]                
Payments to Acquire Interest in Joint Venture $ 13,600,000   $ 13,600,000          
Proceeds from (Repayments of) Notes Payable, Total $ (4,100,000)   $ (4,100,000)          
Income (Loss) from Equity Method Investments, Total             $ 200,000 $ 1,600,000
Sterling at Silverleaf [Member]                
Payments to Acquire Interest in Joint Venture   $ 2,600,000            
Larkspur [Member]                
Income (Loss) from Equity Method Investments, Total       $ 100,000        
Equity Method Investment, Gain (Loss) on Difference Between Carrying Amount and Underlying Equity       $ 300,000        
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%