Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Revenues (Notes 2 and 7)	$ 26,292,741	$ 27,479,673	$ 82,171,442	$ 74,343,914
Ethanol [Member]
Revenue from External Customer [Line Items]
Revenues (Notes 2 and 7)	21,085,207	21,458,476	66,205,355	57,752,939
Distillers' Grains [Member]
Revenue from External Customer [Line Items]
Revenues (Notes 2 and 7)	3,223,158	4,534,953	10,212,515	12,726,044
Other Products [Member]
Revenue from External Customer [Line Items]
Revenues (Notes 2 and 7)	$ 1,984,376	$ 1,486,244	$ 5,753,572	$ 3,864,931