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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, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Revenues $ 10,306 $ 10,133
Operating profit (loss) 4,902 4,924
General and administrative expenses 2,577 2,042
Total operating profit 2,325 2,882
Interest expense 695 911
Depreciation, depletion and amortization 2,716 2,596
Capital expenditures 3,100 6,205
Operating Segments    
Segment Reporting Information [Line Items]    
Depreciation, depletion and amortization 2,607 2,535
Industrial and commercial | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 1,347 1,453
Operating profit (loss) 643 812
Depreciation, depletion and amortization 391 363
Capital expenditures 100 145
Mining royalty lands | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 3,234 2,963
Operating profit (loss) 2,965 2,724
Depreciation, depletion and amortization 178 149
Capital expenditures 48 20
Development | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 301 303
Operating profit (loss) 85 (60)
Depreciation, depletion and amortization 43 42
Capital expenditures 2,650 5,954
Multifamily | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 5,424 5,414
Operating profit (loss) 1,209 1,448
Depreciation, depletion and amortization 1,995 1,981
Capital expenditures $ 302 $ 86