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Investments in unconsolidated joint ventures (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | May 04, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 70.41% |  |  |  |
Total investments | $ 139,655,000 |  |  | $ 139,655,000 |  | $ 145,443,000 |
Total assets of the partnership | 677,040,000 |  |  | 677,040,000 |  | 678,190,000 |
Partnership profit (loss) | 582,000 | $ 281,000 |  | 986,000 | $ 41,156,000 |  |
Share of profit | (1,766,000) | $ (1,118,000) |  | (3,370,000) | (2,753,000) |  |
Real Estate Total Assets [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets of the partnership | $ 505,297,000 |  |  | 505,297,000 |  | 480,544,000 |
Partnership profit (loss) |  |  |  | (5,753,000) |  | (8,573,000) |
Real Estate Partnership Net Income Loss [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Share of profit |  |  |  | $ (3,370,000) |  | $ (5,754,000) |
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 | $ 7,546,000 |  |  | $ 7,546,000 |  | $ 7,488,000 |
Partnership profit (loss) |  |  |  | (42,000) |  | (82,000) |
Share of profit |  |  |  | (21,000) |  | (41,000) |
Brooksville Quarry L L C [Member] | Real Estate Total Assets [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets of the partnership | $ 14,461,000 |  |  | $ 14,461,000 |  | $ 14,301,000 |
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 | $ 5,485,000 |  |  | $ 5,485,000 |  | $ 5,530,000 |
Partnership profit (loss) |  |  |  | (90,000) |  | (230,000) |
Share of profit |  |  |  | (45,000) |  | (115,000) |
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 | $ 22,115,000 |  |  | $ 22,115,000 |  | $ 22,470,000 |
Bryant Street Partnerships [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 61.36% |  |  | 61.36% |  | 61.36% |
Total investments | $ 58,253,000 |  |  | $ 58,253,000 |  | $ 59,558,000 |
Partnership profit (loss) |  |  |  | (4,787,000) |  | (6,084,000) |
Share of profit |  |  |  | (3,186,000) |  | (4,954,000) |
[custom:InterestIncomePreferred] |  |  | $ 234,000 | 236,000 |  |  |
[custom:GuaranteeLiabilityAmortization] |  |  |  |  | $ 236,000 |  |
Bryant Street Partnerships [Member] | Real Estate Total Assets [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets of the partnership | 203,480,000 |  |  | 203,480,000 |  | 204,082,000 |
Aberdeen Station [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments | 917,000 |  |  | 917,000 |  | 514,000 |
Partnership profit (loss) |  |  |  | 0 |  | 0 |
Share of profit |  |  |  | 0 |  | 0 |
Aberdeen Station [Member] | Real Estate Total Assets [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets of the partnership | $ 917,000 |  |  | $ 917,000 |  | $ 514,000 |
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) |  |  |  | (271,000) |  | (481,000) |
Share of profit |  |  |  | 171,000 |  | 343,000 |
D S T Hickory Creek [Member] | Real Estate Total Assets [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets of the partnership | 45,186,000 |  |  | 45,186,000 |  | 46,048,000 |
Amber Ridge Loan [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total investments | 6,234,000 |  |  | 6,234,000 |  | 11,466,000 |
Partnership profit (loss) |  |  |  | 0 |  | 0 |
Amber Ridge Loan [Member] | Real Estate Total Assets [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets of the partnership | $ 6,234,000 |  |  | $ 6,234,000 |  | $ 11,466,000 |
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 | $ 39,112,000 |  |  | $ 39,112,000 |  | $ 38,693,000 |
Partnership profit (loss) |  |  |  | 0 |  | 12,000 |
Share of profit |  |  |  | (64,000) |  | 20,000 |
Half St Owner L L C [Member] | Real Estate Total Assets [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets of the partnership | $ 119,957,000 |  |  | $ 119,957,000 |  | $ 93,932,000 |
Greenville Woodfield Partnerships [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 40.00% |  |  | 40.00% |  | 40.00% |
Total investments | $ 16,108,000 |  |  | $ 16,108,000 |  | $ 16,194,000 |
Partnership profit (loss) |  |  |  | (563,000) |  | (948,000) |
Share of profit |  |  |  | (225,000) |  | (379,000) |
Greenville Woodfield Partnerships [Member] | Real Estate Total Assets [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets of the partnership | 92,947,000 |  |  | 92,947,000 |  | 87,731,000 |
Riverfront Holdings I I L L C [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  | 80.00%
Total investments |  |  |  |  |  | 0 |
Total assets of the partnership |  |  | $ 150,082,000 |  |  |  |
Partnership profit (loss) |  |  |  |  |  | (760,000) |
Share of profit |  |  |  |  |  | (628,000) |
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 |  |  | $ 0 |  | $ 0 |

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