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Business Segments - Schedule of Operating Results and Certain Other Financial Data for Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 41,774 $ 41,506 $ 37,481
Total general and administrative expenses (9,276) (7,971) (7,078)
Total operating profit (loss) 11,704 11,700 7,996
Interest expense 3,150 4,315 3,045
Depreciation, depletion and amortization 10,390 10,975 11,462
Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 41,774 41,506 37,481
Operating profit (loss) 20,980 19,671 15,074
Total general and administrative expenses (9,276) (7,971) (7,078)
Total operating profit (loss) 11,704 11,700 7,996
Interest expense 3,150 4,315 3,045
Depreciation, depletion and amortization 10,187 10,821 11,217
Capital expenditures 51,194 11,217 27,615
Industrial and Commercial | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 5,621 5,354 3,681
Operating profit (loss) 3,110 3,080 1,995
Depreciation, depletion and amortization 1,444 1,374 907
Capital expenditures 151 664 1,284
Mining royalty lands | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 12,852 12,527 10,683
Operating profit (loss) 11,853 11,534 9,768
Depreciation, depletion and amortization 636 497 586
Capital expenditures 159 2 11,218
Development | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 1,205 1,801 1,674
Operating profit (loss) 192 517 (612)
Depreciation, depletion and amortization 171 182 189
Capital expenditures 50,404 9,990 14,521
Multifamily | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 22,096 21,824 21,443
Operating profit (loss) 5,825 4,540 3,923
Depreciation, depletion and amortization 7,936 8,768 9,535
Capital expenditures $ 480 $ 561 $ 592