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Investments in unconsolidated joint ventures (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Mar. 31, 2021
May 04, 2018
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage           70.41%  
Total investments $ 145,975,000   $ 145,975,000   $ 167,071,000    
Total assets of the partnership 678,753,000   678,753,000   536,360,000    
Partnership profit (loss) (113,000) $ 5,271,000 41,043,000 $ 10,747,000      
Share of profit (1,244,000) $ (1,788,000) (3,997,000) $ (3,773,000)      
Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership $ 454,424,000   454,424,000   478,556,000    
Partnership profit (loss)     (5,605,000)   (5,925,000)    
Real Estate Partnership Net Income Loss [Member]              
Schedule of Equity Method Investments [Line Items]              
Share of profit     $ (3,997,000)   $ (5,690,000)    
Brooksville Quarry L L C [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage 50.00%   50.00%   50.00%    
Total investments $ 7,463,000   $ 7,463,000   $ 7,499,000    
Partnership profit (loss)     (66,000)   (78,000)    
Share of profit     (32,000)   (39,000)    
Brooksville Quarry L L C [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership $ 14,332,000   $ 14,332,000   $ 14,347,000    
B C F R P Realty L L C [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage 50.00%   50.00%   50.00%    
Total investments $ 5,454,000   $ 5,454,000   $ 5,184,000    
Partnership profit (loss)     (227,000)   (411,000)    
Share of profit     (113,000)   (207,000)    
B C F R P Realty L L C [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership 22,612,000   22,612,000   $ 22,747,000    
Riverfront Holdings I I L L C [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage         80.00%   80.00%
Total investments 0 [1]   0 [1]   $ 23,533,000    
Total assets of the partnership           $ 150,082,000  
Partnership profit (loss) [1]     (760,000)   (4,573,000)    
Share of profit [1]     (628,000)   (3,907,000)    
Riverfront Holdings I I L L C [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership $ 0 [1]   $ 0 [1]   $ 108,538,000    
Bryant Street Partnerships [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage 61.36%   61.36%   61.36%    
Total investments $ 59,899,000   $ 59,899,000   $ 60,159,000    
Partnership profit (loss)     (3,566,000)   (836,000)    
Share of profit [1]     (3,234,000)   (2,130,000)    
Preferred interest     674,000   1,146,000    
Amortization of guarantee liability     354,000   471,000    
Bryant Street Partnerships [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership 201,144,000   201,144,000   173,814,000    
Hyde Park [Member]              
Schedule of Equity Method Investments [Line Items]              
Total investments 0   0   591,000    
Partnership profit (loss)     0   0    
Share of profit     0   0    
Hyde Park [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership $ 0   $ 0   $ 591,000    
D S T Hickory Creek [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage 26.65%   26.65%   26.65%    
Total investments $ 6,000,000   $ 6,000,000   $ 6,000,000    
Partnership profit (loss)     (325,000)   (367,000)    
Share of profit     257,000   339,000    
D S T Hickory Creek [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership 46,560,000   46,560,000   47,761,000    
Amber Ridge Loan [Member]              
Schedule of Equity Method Investments [Line Items]              
Total investments 12,471,000   12,471,000   10,026,000    
Partnership profit (loss)     0   0    
Share of profit     0   0    
Amber Ridge Loan [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership $ 12,471,000   $ 12,471,000   $ 10,026,000    
Half St Owner L L C [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage 61.37%   61.37%   61.37%    
Total investments $ 38,456,000   $ 38,456,000   $ 37,875,000    
Partnership profit (loss)     19,000   158,000    
Share of profit     25,000   164,000    
Half St Owner L L C [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership $ 76,829,000   $ 76,829,000   $ 54,275,000    
Greenville Woodfield Partnerships [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage 40.00%   40.00%   40.00%    
Total investments $ 16,232,000   $ 16,232,000   $ 16,204,000    
Partnership profit (loss)     (680,000)   182,000    
Share of profit     (272,000)   90,000    
Greenville Woodfield Partnerships [Member] | Real Estate Total Assets [Member]              
Schedule of Equity Method Investments [Line Items]              
Total assets of the partnership $ 80,476,000   $ 80,476,000   $ 46,457,000    
[1] Riverfront Holdings II, LLC was consolidated on March 31, 2021. Bryant Street Partnerships includes $674,000 in 2021 and $1,146,000 in 2020 for the Company’s share of preferred interest and $354,000 in 2021 and $471,000 in 2020 for amortization of guarantee liability related to the Bryant Street loan.