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Business Segments - Schedule of Operating Results and Certain Other Financial Data for Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 10,633 | $ 10,591 | $ 31,243 | $ 31,401
Operating profit (loss) | 5,372 | 4,844 | 15,668 | 14,667
General and administrative expenses | 2,289 | 1,948 | 6,883 | 6,150
Total operating profit (loss) | 3,083 | 2,896 | 8,785 | 8,517
Interest expense | 742 | 1,116 | 2,482 | 3,251
Depreciation, depletion and amortization |  |  | 7,840 | 8,557
Capital expenditures | 34,571 | 2,449 | 47,089 | 4,634
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion and amortization | 2,551 | 2,816 | 7,629 | 8,415
Industrial and commercial | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,455 | 1,442 | 4,353 | 3,932
Operating profit (loss) | 842 | 838 | 2,484 | 2,251
Depreciation, depletion and amortization | 360 | 369 | 1,083 | 1,006
Capital expenditures | 235 | 12 | 628 | 557
Mining royalty lands | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,199 | 3,082 | 9,393 | 9,628
Operating profit (loss) | 2,946 | 2,745 | 8,655 | 8,781
Depreciation, depletion and amortization | 163 | 138 | 471 | 472
Capital expenditures | 18 | 0 | 60 | 0
Development | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 297 | 434 | 905 | 1,387
Operating profit (loss) | 25 | 221 | 102 | 445
Depreciation, depletion and amortization | 43 | 44 | 128 | 140
Capital expenditures | 34,265 | 2,179 | 46,146 | 3,640
Multifamily | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,682 | 5,633 | 16,592 | 16,454
Operating profit (loss) | 1,559 | 1,040 | 4,427 | 3,190
Depreciation, depletion and amortization | 1,985 | 2,265 | 5,947 | 6,797
Capital expenditures | $ 53 | $ 258 | $ 255 | $ 437

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