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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
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Revenues: $ 10,594 $ 10,306
Total general and administrative expenses 4,085 2,577
Total operating profit 512 2,325
Interest expense 708 695
Depreciation, depletion and amortization: 3,027 2,716
Operating expenses 2,130 1,859
Property taxes 1,025 938
Operating Segments    
Segment Reporting Information [Line Items]    
Revenues: 10,594 10,306
Operating profit (loss): 4,597 4,902
Total general and administrative expenses 4,085 2,577
Total operating profit 512 2,325
Interest expense 708 695
Depreciation, depletion and amortization: 2,842 2,607
Operating expenses 2,130 1,859
Property taxes 1,025 938
Capital expenditures: 13,424 3,100
Operating Segments | Industrial and commercial    
Segment Reporting Information [Line Items]    
Revenues: 1,200 1,347
Operating profit (loss): 181 643
Depreciation, depletion and amortization: 566 391
Operating expenses 326 233
Property taxes 127 80
Capital expenditures: 4 100
Operating Segments | Mining royalty lands    
Segment Reporting Information [Line Items]    
Revenues: 3,717 3,234
Operating profit (loss): 3,397 2,965
Depreciation, depletion and amortization: 226 178
Operating expenses 19 16
Property taxes 75 75
Capital expenditures: 148 48
Operating Segments | Development    
Segment Reporting Information [Line Items]    
Revenues: 482 301
Operating profit (loss): 167 85
Depreciation, depletion and amortization: 43 43
Operating expenses 59 25
Property taxes 213 148
Capital expenditures: 13,150 2,650
Operating Segments | Multifamily    
Segment Reporting Information [Line Items]    
Revenues: 5,195 5,424
Operating profit (loss): 852 1,209
Depreciation, depletion and amortization: 2,007 1,995
Operating expenses 1,726 1,585
Property taxes 610 635
Capital expenditures: $ 122 $ 302