Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, lb in Millions, gal in Millions, bu in Millions, T in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) lb $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares	Mar. 31, 2019 USD ($) T lb $ / shares shares bu gal	Mar. 31, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset	$ 9,000,000.0			$ 9,000,000.0
Quarterly Financial Information, Quarterly Charges and Credits, Amount Affecting Comparability				$ 3,600,000
Total Commitment to Sale of Ethanol (gallons) | gal				2.3
Allowance for Doubtful Accounts Receivable	0			$ 0		$ 0
Sale of distillers, grains, and solubles (in tons) | T				0.1
Derivative Assets (Liabilities), at Fair Value, Net	247,000			$ 247,000		(521,000)
Realized & unrealized hedging (gains)	(1,327,000)	$ (2,449,000)		(1,823,000)	$ (353,000)
Net Income (Loss) Available to Common Stockholders, Basic	(1,767,000)	(928,000)		(3,027,000)	159,000
Future And Option Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative Asset	770,000			770,000		1,046,000
Derivative Liability	$ 523,000			$ 523,000		1,567,000
Corn Oil [Member]
Summary Of Significant Accounting Policies [Line Items]
Total Commitment to Sale of Corn Oil (pounds) | lb	4.2			4.2
corn [Member]
Summary Of Significant Accounting Policies [Line Items]
Total purchase commitment				$ 9,300,000
corn [Member] | Future And Option Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Realized & unrealized hedging (gains)	$ 1,030,000	406,000		1,049,000	672,000
corn [Member] | Forward Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative Liability						1,567,000
Realized & unrealized hedging (gains)	297,000	2,043,000		774,000	(319,000)
Fair Value, Inputs, Level 2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Derivative Asset	0			0		0
Derivative Liability	523,000			523,000		1,567,000
Numerator [Member]
Summary Of Significant Accounting Policies [Line Items]
Net Income (Loss) Available to Common Stockholders, Diluted	$ (1,767,000)	$ (928,000)		$ (3,027,000)	$ 159,000
Denominator [Member]
Summary Of Significant Accounting Policies [Line Items]
Weighted Average Number of Shares Outstanding, Basic | shares	13,327	13,327		13,327	13,327
Weighted Average Number of Shares Outstanding, Diluted | shares	13,327	13,327		13,327	14,354
Earnings Per Share, Basic | $ / shares	$ (132.59)	$ (69.63)		$ (227.13)	$ 11.93
Earnings Per Share, Diluted | $ / shares	$ (132.59)	$ (69.63)		$ (227.13)	$ 11.08
Forward Contracts [Member] | corn [Member]
Summary Of Significant Accounting Policies [Line Items]
Total purchase commitment of corn (in bushels) | bu				1.2
Forward Basis Contract [Member] | corn [Member]
Summary Of Significant Accounting Policies [Line Items]
Total purchase commitment of corn (in bushels) | bu				2.5
Retained Earnings [Member] | Numerator [Member]
Summary Of Significant Accounting Policies [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ (1,767,000)
Restatement Adjustment [Member]
Summary Of Significant Accounting Policies [Line Items]
Increase (Decrease) in Other Current Liabilities						722,000
Increase in long-term liabilities						2,834,000
Impact of Restatement on Opening Retained Earnings, Net of Tax						$ 3,556,000
increase in cost of goods and services sold		$ 94,000	$ 94,000		$ 187,000
Increase (Decrease) on Cost of Sales		$ 94,000	$ 94,000		$ 187,000
Decrease (increase) in earnings per share | $ / shares		$ 7,020.00	$ 7,020.00		$ 14,040.00