Lease Commitments (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Jun. 19, 2007	Sep. 30, 2013 Hopper Rail Cars [Member] cars	Mar. 26, 2011 Hopper Rail Cars [Member] mi	Mar. 08, 2011 Tank Rail Cars [Member] cars mi	Feb. 02, 2010 Tank Rail Cars [Member] cars	Sep. 21, 2009 Tank Rail Cars [Member] cars mi
Operating Leased Assets [Line Items]
Number of vehicles					90		15	30	100
Monthly lease payments						$ 56,700	$ 9,750		$ 52,500
Restricted cash	351,000	351,000		351,000
Additional Rental Payments, Over Mileage Threshold						0.025	0.03		0.030
Additional Rental Payments, Mileage Threshold						30,000	30,000		35,000
Operating leases, rent expense	$ 1,816,000	$ 1,890,000	$ 1,745,000