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Business Segments - Business segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Revenues $ 5,553 $ 2,719 $ 10,628 $ 5,354  
Operating profit (456) 990 (359) 1,177  
Interest expense 807 0 1,650 0  
Depreciation, depletion and amortization 2,131 273 4,529 499  
Cash items 311,422   311,422   $ 4,524
Total identifiable net assets 549,944   549,944   418,734
Unallocated          
Segment Reporting Information [Line Items]          
Corporate expenses (1,170) (294) (1,208) (983)  
Discontinued Operations, Disposed of by Sale [Member]          
Segment Reporting Information [Line Items]          
Revenues 4,110 6,641 11,657 13,328  
Operating profit 513 2,996 3,274 6,213  
Interest expense 187 371 587 619  
Depreciation, depletion and amortization 1,217 1,929 3,102 3,762  
Total identifiable net assets 2,210   2,210   176,694
Asset Management          
Segment Reporting Information [Line Items]          
Revenues 568 553 1,149 1,151  
Operating profit (loss) before corporate expenses 258 238 507 522  
Corporate expenses (109) (27) (112) (91)  
Capital expenditures 6 4 167 31  
Depreciation, depletion and amortization 129 128 260 260  
Total identifiable net assets 10,594   10,594   2,960
Mining royalty lands          
Segment Reporting Information [Line Items]          
Revenues 2,055 1,833 3,827 3,595  
Operating profit (loss) before corporate expenses 1,918 1,701 3,536 3,326  
Corporate expenses (52) (28) (129) (94)  
Capital expenditures 0 0 0 0  
Depreciation, depletion and amortization 36 35 90 74  
Total identifiable net assets 38,606   38,606   38,656
Land Development and Construction          
Segment Reporting Information [Line Items]          
Revenues 317 333 614 608  
Operating profit (loss) before corporate expenses (630) (383) (1,007) (778)  
Corporate expenses (283) (217) (702) (725)  
Capital expenditures 1,018 482 1,310 1,707  
Depreciation, depletion and amortization 57 110 114 165  
Total identifiable net assets 45,017   45,017   46,684
RiverFront on the Anacostia          
Segment Reporting Information [Line Items]          
Revenues 2,613 0 5,038 0  
Operating profit (loss) before corporate expenses (293) 0 (1,007) 0  
Corporate expenses (95) 0 (237) 0  
Capital expenditures 185 0 (58) 0  
Depreciation, depletion and amortization 1,909 0 4,065 0  
Total identifiable net assets 140,257 151,837 140,257 151,837 $ 144,386
Corporate          
Segment Reporting Information [Line Items]          
Total identifiable net assets 1,838 4,830 1,838 4,830  
Total Segments          
Segment Reporting Information [Line Items]          
Revenues 5,553 2,719 10,628 5,354  
Operating profit (loss) before corporate expenses 1,253 1,556 2,029 3,070  
Operating profit (456) 990 (359) 1,177  
Corporate expenses (1,709) (566) (2,388) (1,893)  
Interest expense 807 0 1,650 0  
Capital expenditures 1,209 486 1,419 1,738  
Depreciation, depletion and amortization $ 2,131 $ 273 $ 4,529 $ 499