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Business Segments (Tables) | 9 Months Ended
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Sep. 30, 2018
Segment Reporting [Abstract] |
Business segments (in thousands) |
|  | Three Months ended |  | Nine Months ended
|  | September 30, |  | September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset management |  | $ | 568 |  |  |  | 559 |  |  |  | 1,717 |  |  |  | 1,710 |
Mining royalty lands |  |  | 2,125 |  |  |  | 1,786 |  |  |  | 5,952 |  |  |  | 5,381 |
Land development and construction |  |  | 330 |  |  |  | 323 |  |  |  | 944 |  |  |  | 931 |
RiverFront on the Anacostia |  |  | 2,719 |  |  |  | 2,367 |  |  |  | 7,757 |  |  |  | 2,367 |
|  |  | 5,742 |  |  |  | 5,035 |  |  |  | 16,370 |  |  |  | 10,389 |
Operating profit (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before corporate expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset management |  | $ | 276 |  |  |  | 249 |  |  |  | 783 |  |  |  | 771 |
Mining royalty lands |  |  | 1,961 |  |  |  | 1,667 |  |  |  | 5,497 |  |  |  | 4,993 |
Land development and construction |  |  | (139 | ) |  |  | (390 | ) |  |  | (1,146 | ) |  |  | (1,168 | )
RiverFront on the Anacostia |  |  | 92 |  |  |  | (1,168 | ) |  |  | (915 | ) |  |  | (1,168 | )
Operating profit before corporate expenses |  |  | 2,190 |  |  |  | 358 |  |  |  | 4,219 |  |  |  | 3,428 |
Corporate expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated to asset management |  |  | (34 | ) |  |  | (27 | ) |  |  | (146 | ) |  |  | (118 | )
Allocated to mining royalty lands |  |  | (28 | ) |  |  | (30 | ) |  |  | (157 | ) |  |  | (124 | )
Allocated to land development and construction |  |  | (408 | ) |  |  | (210 | ) |  |  | (1,110 | ) |  |  | (935 | )
Allocated to RiverFront on the Anacostia |  |  | (52 | ) |  |  | (27 | ) |  |  | (289 | ) |  |  | (27 | )
Unallocated |  |  | — |  |  |  | (323 | ) |  |  | (1,208 | ) |  |  | (1,306 | )
Total corporate expenses |  |  | (522 | ) |  |  | (617 | ) |  |  | (2,910 | ) |  |  | (2,510 | )
|  | $ | 1,668 |  |  |  | (259 | ) |  |  | 1,309 |  |  |  | 918 |
Interest expense |  | $ | 768 |  |  |  | 783 |  |  |  | 2,418 |  |  |  | 783 |
Depreciation, depletion and amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset management |  | $ | 145 |  |  |  | 125 |  |  |  | 405 |  |  |  | 385 |
Mining royalty lands |  |  | 55 |  |  |  | 17 |  |  |  | 145 |  |  |  | 91 |
Land development and construction |  |  | 57 |  |  |  | 98 |  |  |  | 171 |  |  |  | 263 |
RiverFront on the Anacostia |  |  | 1,564 |  |  |  | 2,564 |  |  |  | 5,629 |  |  |  | 2,564 |
|  | $ | 1,821 |  |  |  | 2,804 |  |  |  | 6,350 |  |  |  | 3,303 |
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset management |  | $ | 17 |  |  |  | 131 |  |  |  | 184 |  |  |  | 162 |
Mining royalty lands |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Land development and construction |  |  | 4,268 |  |  |  | 292 |  |  |  | 5,578 |  |  |  | 1,999 |
RiverFront on the Anacostia |  |  | 25 |  |  |  | 331 |  |  |  | (33 | ) |  |  | 331 |
|  | $ | 4,310 |  |  |  | 754 |  |  |  | 5,729 |  |  |  | 2,492 |
|  | September 30, |  |  |  | December 31, |  |
Identifiable net assets |  | 2018 |  |  |  | 2017 |  |
Asset management | $ | 10,687 |  |  |  | 2,960 |  |
Discontinued operations |  | 3,194 |  |  |  | 176,694 |  |
Mining royalty lands |  | 38,307 |  |  |  | 38,656 |  |
Land development and construction |  | 51,801 |  |  |  | 46,684 |  |
Riverfront on the Anacostia |  | 138,853 |  |  |  | 144,386 |  |
Investments available for sale |  | 191,288 |  |  |  | — |  |
Cash items |  | 69,052 |  |  |  | 4,524 |  |
Unallocated corporate assets |  | 4,077 |  |  |  | 4,830 |  |
| $ | 507,259 |  |  |  | 418,734 |  |

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