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Business Segments - Business segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Sep. 30, 2011
Sep. 30, 2010
Revenues $ 33,030 $ 31,947 $ 94,715 $ 88,800    
Operating profit 4,891 4,441 11,549 10,813    
Interest expense 537 789 2,135 2,533    
Capital expenditures (b) 16,106 4,856 23,305 13,025    
Depreciation, depletion and amortization 3,196 2,965 9,502 9,126    
Identifiable assets 260,413   260,413   245,250  
Discontinued transportation assets 101   101   114  
Cash items 11,838 22,760 11,838 22,760 21,026 17,151
Total identifiable assets 272,352   272,352   266,390  
Transportation
            
Revenues 26,907 26,182 77,197 72,209    
Operating profit 2,682 2,834 6,706 7,603    
Corporate expenses (396) (390) (1,187) (1,169)    
Capital expenditures (b) 1,202 1,501 6,605 4,660    
Depreciation, depletion and amortization 1,690 1,582 5,018 4,680    
Identifiable assets 38,854   38,854   39,001  
Mining royalty land
            
Revenues 1,101 1,180 3,103 3,193    
Operating profit 958 999 2,671 2,626    
Corporate expenses (164) (153) (491) (458)    
Interest expense 10 9 29 27    
Capital expenditures (b) 11,039 0 11,039 0    
Depreciation, depletion and amortization 27 29 86 80    
Identifiable assets 39,469   39,469   28,295  
Developed property rentals
            
Revenues 5,022 4,585 14,415 13,398    
Operating profit 2,150 1,547 5,531 4,172    
Corporate expenses (245) (229) (736) (686)    
Interest expense 527 780 2,106 2,506    
Capital expenditures (b) 2,916 2,517 5,573 6,112    
Capital expenditures - Capitalized interest 533 345 1,111 928    
Capital expenditures - Internal labor 173 190 431 450    
Capital expenditures - Real estate taxes (a) 243 303 (1,454) 875    
Depreciation, depletion and amortization 1,382 1,300 4,096 3,917    
Identifiable assets 179,532   179,532   175,618  
(a) Receivable on previously capitalized real estate taxes on Anacostia property     2,250      
(b) 1031 exchange of real estate   4,941   4,941    
Corporate
            
Corporate expenses (94) (167) (945) (1,275)    
Depreciation, depletion and amortization 97 54 302 449    
Identifiable assets $ 2,558   $ 2,558   $ 2,336