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Accounting Policies (Details Narrative) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) Integer | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 21, 2018 USD ($) Integer
Real Estate Properties [Line Items] |  |  |  |  |
Commercial properties | Integer | 2 |  |  |  |
Investments held to maturity | $ | $ 0 |  |  |  |
Investments held for trading | $ | $ 0 |  |  |  |
Estimated useful lives | 3-39 |  |  |  |
Depreciation and depletion | $ | $ 8,806,000 | $ 5,766,000 | $ 5,784,000 |  |
Brooksville Joint Venture [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Voting interest | 50% or less |  |  |  |
B C F R P Realty Joint Venture [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Voting interest | 50% or less |  |  |  |
Greenville Woodfield Joint Venture [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Voting interest | 50% or less |  |  |  |
Bryant Street Partnerships [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Voting interest | excess of 50% |  |  |  |
Half Street Joint Venture [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Voting interest | excess of 50% |  |  |  |
Wholly Owned Properties [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Commercial properties | Integer | 4 |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Commercial properties | Integer |  |  |  |  | 40
Land parcels | Integer |  |  |  |  | 3
Sale of excluded property | $ |  |  | $ 11,700,000 | $ 347,200,000 |
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Commercial properties | Integer |  |  |  |  | 1
Property value excluded from sale | $ |  |  |  |  | $ 11,700,000

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