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Business Segments - Business segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Revenues $ 6,363 $ 5,553 $ 12,077 $ 10,628  
Operating profit 2,107 (456) 3,462 (359)  
Interest expense 272 807 860 1,650  
Depreciation, depletion and amortization 1,472 2,131 2,959 4,529  
Cash items 76,235   76,235   $ 22,749
Total identifiable net assets 535,147   535,147   505,488
Investments available for sale 122,183   122,183   165,212
Unallocated          
Segment Reporting Information [Line Items]          
Corporate expenses 0 (1,170) 0 (1,208)  
Discontinued Operations, Disposed of by Sale [Member]          
Segment Reporting Information [Line Items]          
Operating profit 45 513 139 3,274  
Interest expense 0 187 0 587  
Depreciation, depletion and amortization 12 1,217 41 3,102  
Total identifiable net assets 871   871   3,224
Asset Management          
Segment Reporting Information [Line Items]          
Revenues 662 568 1,303 1,149  
Operating profit before corporate expenses 128 258 225 507  
Corporate expenses (139) (109) (302) (112)  
Capital expenditures 1,352 6 7,818 167  
Depreciation, depletion and amortization 196 129 373 260  
Total identifiable net assets 16,981   16,981   10,593
Mining royalty lands          
Segment Reporting Information [Line Items]          
Revenues 2,633 2,055 4,862 3,827  
Operating profit before corporate expenses 2,458 1,918 4,502 3,536  
Corporate expenses (36) (52) (79) (129)  
Capital expenditures 0 0 0 0  
Depreciation, depletion and amortization 42 36 94 90  
Total identifiable net assets 38,702   38,702   37,991
Development          
Segment Reporting Information [Line Items]          
Revenues 316 317 585 614  
Operating profit before corporate expenses (565) (630) (1,118) (1,007)  
Corporate expenses (341) (283) (740) (702)  
Capital expenditures (122) 1,018 248 1,310  
Depreciation, depletion and amortization 49 57 107 114  
Total identifiable net assets 115,016   115,016   119,029
Stabilized Joint Venture          
Segment Reporting Information [Line Items]          
Revenues 2,752 2,613 5,327 5,038  
Operating profit before corporate expenses 637 (293) 1,049 (1,007)  
Corporate expenses (35) (95) (75) (237)  
Capital expenditures 227 185 110 (58)  
Depreciation, depletion and amortization 1,185 1,909 2,385 4,065  
Total identifiable net assets 136,048   136,048   138,206
Corporate          
Segment Reporting Information [Line Items]          
Total identifiable net assets 29,111   29,111   $ 8,484
Total Segments          
Segment Reporting Information [Line Items]          
Revenues 6,363 5,553 12,077 10,628  
Operating profit before corporate expenses 2,658 1,253 4,658 2,029  
Operating profit 2,107 (456) 3,462 (359)  
Corporate expenses (551) (1,709) (1,196) (2,388)  
Interest expense 272 807 860 1,650  
Capital expenditures 1,457 1,209 8,176 1,419  
Depreciation, depletion and amortization $ 1,472 $ 2,131 $ 2,959 $ 4,529