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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.

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