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Business Segments - Business segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Revenues $ 9,512 $ 8,823    
Operating profit 4,004 6,600    
Interest expense 306 481    
Depreciation, depletion and amortization 2,095 1,896    
Cash items 0 0 $ 0 $ 419
Total identifiable net assets 266,560   264,789  
Asset Management        
Segment Reporting Information [Line Items]        
Revenues 7,321 6,915    
Operating profit before corporate expenses 3,509 3,388    
Corporate expenses (485) (378)    
Interest expense 306 481    
Capital expenditures 1,199 9,237    
Depreciation, depletion and amortization 2,005 1,798    
Total identifiable net assets 169,736   170,562  
Mining royalty lands        
Segment Reporting Information [Line Items]        
Revenues 1,880 1,659    
Operating profit before corporate expenses 1,750 1,525    
Corporate expenses (42) (55)    
Capital expenditures 2 0    
Depreciation, depletion and amortization 35 34    
Total identifiable net assets 39,259   39,570  
Land Development and Construction        
Segment Reporting Information [Line Items]        
Revenues 311 249    
Operating profit before corporate expenses (400) 2,419    
Corporate expenses (328) (299)    
Capital expenditures 4,206 1,302    
Depreciation, depletion and amortization 55 64    
Total identifiable net assets 57,126   54,157  
Corporate        
Segment Reporting Information [Line Items]        
Total identifiable net assets 439   $ 500  
Total Segments        
Segment Reporting Information [Line Items]        
Revenues 9,512 8,823    
Operating profit 4,004 6,600    
Corporate expenses (855) (732)    
Capital expenditures 5,407 10,539    
Depreciation, depletion and amortization $ 2,095 $ 1,896