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Business Segments (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Business segments (in thousands) |
| Three Months ended |
| March 31, |
|  | 2018 |  |  |  | 2017 |  |
Revenues: |  |  |  |  |  |  |  |
Asset management | $ | 8,128 |  |  |  | 7,285 |  |
Mining royalty lands |  | 1,772 |  |  |  | 1,762 |  |
Land development and construction |  | 297 |  |  |  | 275 |  |
Riverfront on the Anacostia |  | 2,425 |  |  |  | — |  |
| $ | 12,622 |  |  |  | 9,322 |  |
Operating profit (Loss): |  |  |  |  |  |  |  |
Before corporate expenses: Asset management | $ | 3,767 |  |  |  | 3,501 |  |
Mining royalty lands |  | 1,618 |  |  |  | 1,625 |  |
Land development and construction |  | (387 | ) |  |  | (395 | ) |
Riverfront on the Anacostia |  | (714 | ) |  |  | — |  |
Corporate expenses: |  |  |  |  |  |  |  |
Allocated to asset management |  | (788 | ) |  |  | (753 | ) |
Allocated to mining royalty |  | (77 | ) |  |  | (66 | ) |
Allocated to land development and construction |  | (419 | ) |  |  | (508 | ) |
Allocated to Riverfront on the Anacostia |  | (142 | ) |  |  | — |  |
|  | (1,426 | ) |  |  | (1,327 | ) |
| $ | 2,858 |  |  |  | 3,404 |  |
Interest expense: |  |  |  |  |  |  |  |
Asset management | $ | 290 |  |  |  | 248 |  |
Riverfront on the Anacostia |  | 953 |  |  |  | — |  |
| $ | 1,243 |  |  |  | 248 |  |
Depreciation, depletion and amortization: |  |  |  |  |  |  |  |
Asset management | $ | 2,016 |  |  |  | 1,965 |  |
Mining royalty lands |  | 54 |  |  |  | 39 |  |
Land development and construction |  | 57 |  |  |  | 55 |  |
Riverfront on the Anacostia |  | 2,156 |  |  |  | — |  |
| $ | 4,283 |  |  |  | 2,059 |  |
Capital expenditures: |  |  |  |  |  |  |  |
Asset management | $ | 902 |  |  |  | 2,259 |  |
Mining royalty lands |  | — |  |  |  | — |  |
Land development and construction |  | 925 |  |  |  | 1,470 |  |
Riverfront on the Anacostia |  | (243 | ) |  |  | — |  |
| $ | 1,584 |  |  |  | 3,729 |  |
|  | March 31, |  |  |  | December 31, |  |
Identifiable net assets |  | 2018 |  |  |  | 2017 |  |
Asset management | $ | 186,711 |  |  |  | 179,654 |  |
Mining royalty lands |  | 38,579 |  |  |  | 38,656 |  |
Land development and construction |  | 39,220 |  |  |  | 46,684 |  |
Riverfront on the Anacostia |  | 142,121 |  |  |  | 144,386 |  |
Cash items |  | 6,961 |  |  |  | 4,524 |  |
Unallocated corporate assets |  | 4,392 |  |  |  | 4,830 |  |
| $ | 417,984 |  |  |  | 418,734 |  |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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