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Business Segments - Schedule of Operating Results and Certain Other Financial Data for Business Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 41,774 | $ 41,506 | $ 37,481
Total general and administrative expenses | (9,276) | (7,971) | (7,078)
Total operating profit (loss) | 11,704 | 11,700 | 7,996
Interest expense | 3,150 | 4,315 | 3,045
Depreciation, depletion and amortization | 10,390 | 10,975 | 11,462
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 41,774 | 41,506 | 37,481
Operating profit (loss) | 20,980 | 19,671 | 15,074
Total general and administrative expenses | (9,276) | (7,971) | (7,078)
Total operating profit (loss) | 11,704 | 11,700 | 7,996
Interest expense | 3,150 | 4,315 | 3,045
Depreciation, depletion and amortization | 10,187 | 10,821 | 11,217
Capital expenditures | 51,194 | 11,217 | 27,615
Industrial and Commercial | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 5,621 | 5,354 | 3,681
Operating profit (loss) | 3,110 | 3,080 | 1,995
Depreciation, depletion and amortization | 1,444 | 1,374 | 907
Capital expenditures | 151 | 664 | 1,284
Mining royalty lands | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 12,852 | 12,527 | 10,683
Operating profit (loss) | 11,853 | 11,534 | 9,768
Depreciation, depletion and amortization | 636 | 497 | 586
Capital expenditures | 159 | 2 | 11,218
Development | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,205 | 1,801 | 1,674
Operating profit (loss) | 192 | 517 | (612)
Depreciation, depletion and amortization | 171 | 182 | 189
Capital expenditures | 50,404 | 9,990 | 14,521
Multifamily | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 22,096 | 21,824 | 21,443
Operating profit (loss) | 5,825 | 4,540 | 3,923
Depreciation, depletion and amortization | 7,936 | 8,768 | 9,535
Capital expenditures | $ 480 | $ 561 | $ 592

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