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Accounting Policies (Details)		12 Months Ended
	Apr. 12, 2024	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($)	Nov. 04, 2022
Common stock split ratio	2
Common stock, par value (in dollars per share) | $ / shares		$ 0.10	$ 0.10
Investments held for trading		$ 0	$ 0
Mining accounts receivable		1,352,000	1,046,000
Mining deferred revenue liabilities		2,437,000	925,000
Depreciation and depletion		$ 10,004,000	$ 10,668,000	$ 10,618,000
Maximum | Building and Building Improvements
Estimated useful life		39 years
Minimum | Building and Building Improvements
Estimated useful life		3 years
Buzzard Point Sponsor, LLC
Common Ownership		50.00%	50.00%
Buzzard Point Sponsor, LLC | Maximum
Common Ownership		50.00%
Brooksville Joint Venture | Maximum
Common Ownership		50.00%
B C F R P Realty Joint Venture | Maximum
Common Ownership		50.00%
Estero Partnership
Common Ownership		16.00%	16.00%
Estero Partnership | Maximum
Common Ownership		50.00%
Greenville Woodfield Joint Venture | Maximum
Common Ownership		50.00%
Half Street Joint Venture
Common Ownership		50.00%
Bryant Street Partnership
Common Ownership		50.00%
Mining royalty lands
Mining accounts receivable		$ 647,000	$ 465,000	618,000
Mining deferred revenue liabilities		$ 1,908,000	$ 325,000	$ 47,000
Steuart Investment Company
Steuart ownership interest					20.00%

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