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Business Segments - Business segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 10,477 | $ 10,696 | $ 20,610 | $ 20,810
Operating profit (loss) | 5,372 | 5,176 | 10,296 | 9,823
General and administrative expenses | (2,552) | (2,409) | (4,594) | (4,202)
Total operating profit | 2,820 | 2,767 | 5,702 | 5,621
Interest expense | 829 | 1,129 | 1,740 | 2,135
Depreciation, depletion and amortization |  |  | 5,210 | 5,724
Capital expenditures | 6,313 | 979 | 12,518 | 2,185
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion and amortization | 2,543 | 2,819 | 5,078 | 5,599
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
General and administrative expenses | (551) | 0 | (551) | 0
Industrial and commercial | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,445 | 1,420 | 2,898 | 2,490
Operating profit (loss) | 830 | 822 | 1,642 | 1,413
General and administrative expenses | (340) | (412) | (590) | (708)
Depreciation, depletion and amortization | 360 | 359 | 723 | 637
Capital expenditures | 248 | 65 | 393 | 545
Mining royalty lands | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,231 | 3,264 | 6,194 | 6,546
Operating profit (loss) | 2,985 | 3,023 | 5,709 | 6,036
General and administrative expenses | (342) | (291) | (620) | (514)
Depreciation, depletion and amortization | 159 | 151 | 308 | 334
Capital expenditures | 22 | 0 | 42 | 0
Development | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 305 | 467 | 608 | 953
Operating profit (loss) | 137 | 174 | 77 | 224
General and administrative expenses | (1,029) | (1,461) | (2,307) | (2,546)
Depreciation, depletion and amortization | 43 | 41 | 85 | 96
Capital expenditures | 5,927 | 867 | 11,881 | 1,461
Multifamily | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,496 | 5,545 | 10,910 | 10,821
Operating profit (loss) | 1,420 | 1,157 | 2,868 | 2,150
General and administrative expenses | (290) | (245) | (526) | (434)
Depreciation, depletion and amortization | 1,981 | 2,268 | 3,962 | 4,532
Capital expenditures | $ 116 | $ 47 | $ 202 | $ 179

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