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Operating results and certain other financial data for the Company’s business segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Revenues $ 8,473 $ 6,098 $ 22,821 $ 17,730
Operating profit before corporate expenses 1,389 2,218 4,501 6,429
Corporate expenses (657) (637) (2,486) (2,850)
Operating profit  732 1,581 2,015 3,579
  414 46 1,785 142
Depreciation, depletion and amortization     9,772 4,572
Capital expenditures 4,710 2,033 11,555 3,200
Asset Management [Member]        
Segment Reporting Information [Line Items]        
Revenues 619 721 1,919 2,089
Operating profit before corporate expenses 169 200 528 700
Corporate expenses (180) (165) (682) (738)
Depreciation, depletion and amortization 137 137 408 529
Capital expenditures 100 233 318 787
Mining Properties [Member]        
Segment Reporting Information [Line Items]        
Revenues 2,249 2,507 7,198 7,094
Operating profit before corporate expenses 2,037 2,291 6,531 6,486
Corporate expenses (69) (53) (258) (234)
Depreciation, depletion and amortization 38 60 161 160
Capital expenditures 0 0 0 0
Development [Member]        
Segment Reporting Information [Line Items]        
Revenues 401 290 1,169 862
Operating profit before corporate expenses (404) (659) (1,201) (2,136)
Corporate expenses (326) (381) (1,267) (1,710)
Depreciation, depletion and amortization 53 53 159 160
Capital expenditures 4,237 1,754 10,443 2,371
Stabilized Joint Venture [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,204 2,580 12,535 7,685
Operating profit before corporate expenses (413) 386 (1,357) 1,379
Corporate expenses (82) (38) (279) (168)
Depreciation, depletion and amortization 3,568 1,188 8,899 3,557
Capital expenditures 373 46 794 42
Total Segments [Member]        
Segment Reporting Information [Line Items]        
Depreciation, depletion and amortization $ 3,796 $ 1,438 $ 9,627 $ 4,406