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Business Segments (Tables)
3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Business segments (in thousands)
    Three Months ended
    March 31,
    2021   2020
Revenues:        
 Asset management   $ 712       652  
 Mining royalty lands     2,315       2,185  
 Development     317       293  
 Stabilized Joint Venture     2,509       2,653  
      5,853       5,783  
                 
Operating profit (loss):                
 Before corporate expenses:                
   Asset management   $ 231       177  
   Mining royalty lands     2,094       2,001  
   Development     (386 )     (774 )
   Stabilized Joint Venture     282       577  
    Operating profit before corporate expenses     2,221       1,981  
 Corporate expenses:                
  Allocated to asset management     (214 )     (308 )
  Allocated to mining royalty lands     (81 )     (97 )
  Allocated to development     (419 )     (712 )
  Allocated to Stabilized Joint Venture     (65 )     (70
    Total corporate expenses     (779 )     (1,187 )
    $ 1,442       794  
                 
Interest expense   $ 925       51  
                 
Depreciation, depletion and amortization:                
 Asset management   $ 137       192  
 Mining royalty lands     65       38  
 Development     53       54  
 Stabilized Joint Venture     1,188       1,184  
    $ 1,443       1,468  
Capital expenditures:                
 Asset management   $ 79       213  
 Mining royalty lands     —         —    
 Development     3,299       297  
 Stabilized Joint Venture     9       (23
    $ 3,387       487  
Segment identifiable assets (in thousands)
      March 31,       December 31,    
Identifiable net assets   2021       2020    
                 
Asset management $ 11,013       11,172    
Mining royalty lands   37,335       37,387    
Development   176,239       196,212    
Stabilized Joint Venture   274,774       130,472    
Investments available for sale at fair value   51,171       75,609    
Cash items   117,377       74,105    
Unallocated corporate assets   12,122       11,403    
  $ 680,031       536,360