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Business Segments - Business segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]            
Revenues $ 9,360 $ 9,243 $ 18,682 $ 18,858    
Operating profit 3,986 1,966 7,390 5,475    
Interest expense 371 392 619 807    
Depreciation, depletion and amortization 2,202 2,066 4,261 3,995    
Cash items 0 3,469 0 3,469 $ 0 $ 0
Total identifiable net assets 271,210   271,210   266,560  
Asset Management            
Segment Reporting Information [Line Items]            
Revenues 7,194 6,927 14,479 14,501    
Operating profit before corporate expenses 3,234 3,318 6,735 6,741    
Corporate expenses (321) (354) (1,074) (874)    
Interest expense 371 392 619 807    
Capital expenditures 3,532 761 4,788 1,234    
Depreciation, depletion and amortization 2,057 1,985 4,022 3,820    
Total identifiable net assets 179,350   179,350   169,736  
Mining royalty lands            
Segment Reporting Information [Line Items]            
Revenues 1,833 2,059 3,595 3,837    
Operating profit before corporate expenses 1,701 1,940 3,326 3,589    
Corporate expenses (28) (52) (94) (127)    
Capital expenditures 0 102 0 106    
Depreciation, depletion and amortization 35 15 74 46    
Total identifiable net assets 38,990   38,990   39,259  
Land Development and Construction            
Segment Reporting Information [Line Items]            
Revenues 333 257 608 520    
Operating profit before corporate expenses (383) (2,608) (778) (3,163)    
Corporate expenses (217) (278) (725) (691)    
Capital expenditures 878 611 3,351 1,090    
Depreciation, depletion and amortization 110 66 165 129    
Total identifiable net assets 49,527   49,527   57,126  
Corporate            
Segment Reporting Information [Line Items]            
Total identifiable net assets 3,343   3,343   $ 439  
Total Segments            
Segment Reporting Information [Line Items]            
Revenues 9,360 9,243 18,682 18,858    
Operating profit 3,986 1,966 7,390 5,475    
Corporate expenses (566) (684) (1,893) (1,692)    
Capital expenditures 4,410 1,474 8,139 2,430    
Depreciation, depletion and amortization $ 2,202 $ 2,066 $ 4,261 $ 3,995