v3.26.1
Business Segments - Schedule of Operating Results and Certain Other Financial Data for Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Revenues: $ 11,083 $ 10,850 $ 21,677 $ 21,156
Total general and administrative expenses 3,687 2,885 7,772 5,462
Total operating profit 1,459 1,657 1,971 3,982
Depreciation, depletion and amortization:     6,138 5,622
Operating expenses 1,972 2,580 4,102 4,439
Property taxes 1,042 1,002 2,067 1,940
Operating Segments        
Segment Reporting [Line Items]        
Revenues: 11,083 10,850 21,677 21,156
Operating profit (loss): 5,146 4,542 9,743 9,444
Total general and administrative expenses 3,687 2,885 7,772 5,462
Total operating profit 1,459 1,657 1,971 3,982
Depreciation, depletion and amortization: 2,923 2,726 5,765 5,333
Operating expenses 1,972 2,580 4,102 4,439
Property taxes 1,042 1,002 2,067 1,940
Capital expenditures: 18,842 6,061 32,266 9,161
Operating Segments | Industrial and commercial        
Segment Reporting [Line Items]        
Revenues: 983 1,374 2,183 2,721
Operating profit (loss): (3) 443 178 1,086
Depreciation, depletion and amortization: 600 571 1,166 962
Operating expenses 259 230 585 463
Property taxes 127 130 254 210
Capital expenditures: 226 38 230 138
Operating Segments | Mining royalty lands        
Segment Reporting [Line Items]        
Revenues: 4,066 3,609 7,783 6,843
Operating profit (loss): 3,679 3,340 7,076 6,305
Depreciation, depletion and amortization: 271 177 497 355
Operating expenses 38 16 57 32
Property taxes 78 76 153 151
Capital expenditures: 103 180 251 228
Operating Segments | Development        
Segment Reporting [Line Items]        
Revenues: 595 300 1,077 601
Operating profit (loss): 287 (698) 454 (613)
Depreciation, depletion and amortization: 43 43 86 86
Operating expenses 52 807 111 832
Property taxes 213 148 426 296
Capital expenditures: 18,378 5,524 31,528 8,174
Operating Segments | Multifamily        
Segment Reporting [Line Items]        
Revenues: 5,439 5,567 10,634 10,991
Operating profit (loss): 1,183 1,457 2,035 2,666
Depreciation, depletion and amortization: 2,009 1,935 4,016 3,930
Operating expenses 1,623 1,527 3,349 3,112
Property taxes 624 648 1,234 1,283
Capital expenditures: $ 135 $ 319 $ 257 $ 621