Commitments and Major Customer Purchase committments (Details)	9 Months Ended
	Jun. 30, 2017 USD ($) MMBTU T bu
Long-term Purchase Commitment [Line Items]
Purchase Commitment, Transportation Fees	$ 3,600,000
Long-term Purchase Commitment, Period	10 years
Purchase Commitment, Remaining Minimum Amount Committed	$ 2,100,000
Corn [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount	$ 0
purchase commitment , remaining quantity | bu	95,000
Natural Gas [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Minimum Energy Volume Required | MMBTU	614,775
Grain drying and cooling system [Member]
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Amount	$ 4,800,000
Performance Fees	450,000
Payments for Construction in Process	$ 3,600,000
Distillers Grains [Member]
Long-term Purchase Commitment [Line Items]
Supply Commitment, quantity, Priced Contracts | T	11,450