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Business Segments - Business segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Nov. 07, 2013
Sep. 30, 2013
Sep. 30, 2012
Revenues $ 41,248 $ 35,708 $ 119,975 $ 102,633      
Operating profit 5,730 6,070 13,000 14,786      
Interest expense 438 1,137 1,095 2,145      
Capital expenditures (a) 12,068 14,016 26,007 26,948      
Depreciation, depletion and amortization 4,072 3,624 12,015 10,362      
Cash items 614 742 614 742   502 6,713
Total identifiable net assets 304,363   304,363     287,093  
(a) Capital expenditures related to the Pipeline Transportation, Inc. acquisition         3,397    
Transportation
              
Revenues 33,569 28,794 97,060 82,609      
Operating profit 2,867 3,513 6,139 8,109      
Corporate expenses (422) (406) (1,341) (1,284)      
Capital expenditures (a) 2,732 3,311 11,873 10,672      
Depreciation, depletion and amortization 2,225 1,865 6,549 5,445      
Identifiable net assets 60,820   60,820     49,410  
(a) Capital expenditures related to the Pipeline Transportation, Inc. acquisition 3,397   3,397        
Mining royalty land
              
Revenues 1,395 1,299 3,889 3,874      
Operating profit 1,241 1,156 3,437 3,457      
Corporate expenses (188) (176) (566) (528)      
Interest expense 32 15 97 38      
Capital expenditures (a) 0 0 0 0      
Depreciation, depletion and amortization 36 27 92 75      
Identifiable net assets 39,301   39,301     40,008  
Developed property rentals
              
Revenues 6,284 5,615 19,026 16,150      
Operating profit 2,675 2,451 7,518 6,960      
Corporate expenses (284) (264) (850) (792)      
Interest expense 406 1,122 998 2,107      
Capital expenditures (a) 8,784 9,978 12,354 13,816      
Capital expenditures - Capitalized interest 360 367 1,353 1,375      
Capital expenditures - Internal labor 146 106 341 324      
Capital expenditures - Real estate taxes 46 254 86 761      
Depreciation, depletion and amortization 1,691 1,629 5,013 4,532      
Identifiable net assets 201,619   201,619     195,476  
Corporate
              
Corporate expenses (159) (204) (1,337) (1,136)      
Depreciation, depletion and amortization 120 103 361 310      
Identifiable net assets $ 2,009   $ 2,009     $ 1,697