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Business Segments - Business Segments (Details) (USD $)
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Revenues $ 127,514,000 $ 120,106,000 $ 111,338,000  
Operating profit 14,101,000 14,369,000 14,503,000  
Interest expense 2,638,000 3,346,000 3,928,000  
Capital expenditures 34,348,000 17,872,000 10,703,000  
Capital expenditures - capitalized interest 1,646,000 1,232,000 952,000  
Depreciation, depletion and amortization 12,994,000 12,210,000 11,507,000  
Identifiable net assets 268,992,000 245,250,000 240,019,000  
Discontinued transportation assets 0 114,000 542,000  
Cash items 6,713,000 21,026,000 17,151,000 15,803,000
Transportation
        
Revenues 103,476,000 97,801,000 89,637,000  
Operating profit 9,107,000 9,602,000 9,716,000  
Corporate expenses (1,631,000) (1,574,000) (1,480,000)  
Capital expenditures 10,459,000 6,743,000 6,568,000  
Depreciation, depletion and amortization 6,750,000 6,269,000 6,143,000  
Identifiable net assets 42,642,000 39,001,000 43,100,000  
Mining royalty land
        
Revenues 4,483,000 4,261,000 4,510,000  
Operating profit 3,905,000 3,507,000 3,696,000  
Corporate expenses (674,000) (650,000) (588,000)  
Interest expense 40,000 37,000 39,000  
Capital expenditures 11,039,000 0 59,000  
Depreciation, depletion and amortization 112,000 111,000 103,000  
Identifiable net assets 39,695,000 28,295,000 28,651,000  
Developed property rentals
        
Revenues 19,555,000 18,044,000 17,191,000  
Operating profit 5,497,000 5,874,000 5,126,000  
Corporate expenses (1,012,000) (975,000) (883,000)  
Interest expense 2,598,000 3,309,000 3,889,000  
Capital expenditures 11,804,000 8,082,000 1,686,000  
Capital expenditures - capitalized interest 1,646,000 1,232,000 952,000  
Capital expenditures - internal labor 609,000 603,000 281,000  
Capital expenditures - real estate taxes (a) (1,209,000) 1,212,000 1,157,000  
Depreciation, depletion and amortization 5,729,000 5,222,000 5,053,000  
Identifiable net assets 184,358,000 175,618,000 164,601,000  
(a) Receivable on previously capitalized real estate taxes on Anacostia property 2,311,000      
(b) 1031 exchange of real estate   4,941,000    
Corporate and Other [Member]
        
Corporate expenses (1,091,000) (1,415,000) (1,084,000)  
Depreciation, depletion and amortization 403,000 608,000 208,000  
Identifiable net assets $ 2,297,000 $ 2,336,000 $ 3,667,000