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Business Segments - Business segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Revenues $ 5,853 $ 5,783  
Operating profit 1,442 794  
Corporate expenses 779 1,187  
Interest expense 925 51  
Depreciation, depletion and amortization 1,443 1,468  
Cash items 117,377   $ 74,105
Total identifiable net assets 680,031   536,360
Investments available for sale 51,171   75,609
Asset Management      
Segment Reporting Information [Line Items]      
Revenues 712 652  
Operating profit before corporate expenses 231 177  
Corporate expenses (214) (308)  
Capital expenditures 79 213  
Depreciation, depletion and amortization 137 192  
Total identifiable net assets 11,013   11,172
Mining royalty lands      
Segment Reporting Information [Line Items]      
Revenues 2,315 2,185  
Operating profit before corporate expenses 2,094 2,001  
Corporate expenses (81) (97)  
Capital expenditures 0 0  
Depreciation, depletion and amortization 65 38  
Total identifiable net assets 37,335   37,387
Development      
Segment Reporting Information [Line Items]      
Revenues 317 293  
Operating profit before corporate expenses (386) (774)  
Corporate expenses (419) (712)  
Capital expenditures 3,299 297  
Depreciation, depletion and amortization 53 54  
Total identifiable net assets 176,239   196,212
Stabilized Joint Venture      
Segment Reporting Information [Line Items]      
Revenues 2,509 2,653  
Operating profit before corporate expenses 282 577  
Corporate expenses (65) (70)  
Capital expenditures 9 (23)  
Depreciation, depletion and amortization 1,188 1,184  
Total identifiable net assets 274,774   130,472
Total Segments      
Segment Reporting Information [Line Items]      
Revenues 5,853 5,783  
Operating profit before corporate expenses 2,221 1,981  
Operating profit 1,442 794  
Corporate expenses (779) (1,187)  
Interest expense 925 51  
Capital expenditures 3,387 487  
Depreciation, depletion and amortization 1,443 $ 1,468  
Corporate      
Segment Reporting Information [Line Items]      
Total identifiable net assets $ 12,122   $ 11,403