Business Segments - Business segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues	$ 38,820	$ 33,057
Operating profit	4,124	4,408
Interest expense	311	428
Depreciation, depletion and amortization	3,775	3,271
Cash items	579	1,440	502	6,713
Total identifiable net assets	303,669		287,093
(a) Capital expenditures related to the Pipeline Transportation, Inc. acquisition	3,397
Transportation
Revenues	31,591	26,639
Operating profit	1,948	2,268
Corporate expenses	(492)	(471)
Capital expenditures (a)	8,731	6,787
Depreciation, depletion and amortization	2,030	1,753
Identifiable net assets	64,038		49,410
Mining royalty land
Revenues	1,268	1,331
Operating profit	1,128	1,199
Corporate expenses	(189)	(176)
Interest expense	26	11
Capital expenditures (a)	0	0
Depreciation, depletion and amortization	28	25
Identifiable net assets	39,914		40,008
Developed property rentals
Revenues	5,961	5,087
Operating profit	2,366	2,115
Corporate expenses	(283)	(264)
Interest expense	285	417
Capital expenditures (a)	3,134	3,212
Capital expenditures - Capitalized interest	516	591
Capital expenditures - Internal labor	95	110
Capital expenditures - Real estate taxes	24	251
Depreciation, depletion and amortization	1,599	1,388
Identifiable net assets	197,174		195,476
Corporate
Corporate expenses	(354)	(263)
Depreciation, depletion and amortization	118	105
Identifiable net assets	$ 1,964		$ 1,697