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Business Segments - Business segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Revenues $ 33,868 $ 31,326 $ 66,925 $ 61,685    
Operating profit 4,308 3,444 8,716 6,658    
Corporate expenses (1,516) (1,364) (2,690) (2,460)    
Interest expense 580 794 1,008 1,598    
Capital expenditures 1,981 1,864 12,932 7,199    
Depreciation, depletion and amortization 3,467 3,223 6,738 6,306    
Cash items 4,527 20,037 4,527 20,037 6,713 21,026
Total identifiable assets 278,304   278,304   275,705  
(a) Receivable on previously capitalized real estate taxes on Anacostia property     41 2,250    
Transportation
            
Revenues 27,176 25,449 53,815 50,290    
Operating profit 2,328 2,186 4,596 4,024    
Corporate expenses (407) (396) (878) (791)    
Capital expenditures 574 614 7,361 5,403    
Depreciation, depletion and amortization 1,827 1,720 3,580 3,328    
Identifiable assets 45,432   45,432   42,642  
Mining royalty land
            
Revenues 1,244 1,025 2,575 2,002    
Operating profit 1,102 865 2,301 1,713    
Corporate expenses (176) (163) (352) (327)    
Interest expense 12 9 23 19    
Capital expenditures 0 0 0 0    
Depreciation, depletion and amortization 23 27 48 59    
Identifiable assets 39,476   39,476   39,695  
Developed property rentals
            
Revenues 5,448 4,852 10,535 9,393    
Operating profit 2,394 1,757 4,509 3,381    
Corporate expenses (264) (246) (528) (491)    
Interest expense 568 785 985 1,579    
Capital expenditures 626 939 3,838 2,657    
Capital expenditures - Capitalized interest 417 284 1,008 578    
Capital expenditures - Internal labor 108 117 218 258    
Capital expenditures - Real estate taxes (a) 256 (90) 507 (1,697)    
Depreciation, depletion and amortization 1,515 1,373 2,903 2,714    
Identifiable assets 186,495   186,495   184,358  
(a) Receivable on previously capitalized real estate taxes on Anacostia property             
Corporate
            
Corporate expenses (669) (559) (932) (851)    
Depreciation, depletion and amortization 102 103 207 205    
Identifiable assets $ 2,374   $ 2,374   $ 2,297