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Business Segments (Tables)
9 Months Ended
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