Summary Of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, bu in Thousands, T in Thousands, lb in Millions, gal in Millions			3 Months Ended						12 Months Ended
	Nov. 15, 2019 USD ($) shares	Nov. 08, 2019 USD ($)	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Sep. 30, 2019 USD ($) T lb $ / shares shares bu gal	Sep. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Sep. 30, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items]
Balance Sheet Impact of Restatement										$ 5,400,000
Revenues									$ 216,993,000	214,990,000
Cost of Goods and Services Sold									219,017,000	211,350,000
Gross Profit									(2,024,000)	3,640,000
General and Administrative Expense									4,837,000	4,972,000
Interest Income (Expense), Net									999,000	1,672,000
Net Income (Loss) Attributable to Parent									$ (8,497,000)	$ (2,704,000)
Earnings Per Share, Basic | $ / shares									$ (637.58)	$ (202.90)
Earnings Per Share, Diluted | $ / shares									$ (637.58)	$ (202.90)
Inventory, Net									$ 17,167,000	$ 13,526,000
Assets, Current									27,967,000	29,025,000
Property, Plant and Equipment, Net									111,449,000	111,868,000
Assets									140,863,000	142,631,000
Long-term Debt, Current Maturities									580,000	6,560,000
Liabilities, Current									21,854,000	18,707,000
Long-term Debt, Excluding Current Maturities									25,832,000	15,333,000
Retained Earnings (Accumulated Deficit)									2,140,000	10,637,000
Liabilities and Equity									140,863,000	142,631,000
Accounts Receivable, Allowance for Credit Loss									$ 0
Total Commitment to Sale of Ethanol (gallons) | gal									3.0
Sale of dried distillers grains and solubles (in tons) | T									89
change in fair value of put option, anti-dilutive									$ 637,000	(300,000)
Sale of wet distillers grains and solubles (in tons) | T									72
Total Commitment to Sale of Corn Oil (pounds) | lb									4.3
Total purchase commitment of corn (in bushels) | bu									3,600
Total purchase commitment									$ 14,600,000
Total purchase commitment of corn basis contracts, bushels | bu									311
Derivative Assets									$ 78,000	1,046,000
Derivative Liability									597,000	1,567,000
Derivative, Fair Value, Net									$ (519,000)	(521,000)
Stock Repurchased During Period, Shares | shares									1,018
Net Income (Loss) Available to Common Stockholders, Diluted									$ (7,860,000)	$ (3,004,000)
Weighted Average Number of Shares Outstanding, Basic | shares									13,327	13,327
Weighted Average Number of Shares Outstanding, Diluted | shares									13,327	13,327
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net									$ (2,825,000)	$ (1,674,000)
Fair Value, Put Option Liability									0	5,400,000
Forward Contracts [Member]
Debt Securities, Available-for-sale [Line Items]
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net									1,530,000	(1,894,000)
Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Line Items]
Derivative Assets									0	0
Derivative Liability									0	0
Warrants and Rights Outstanding									6,037,000	5,400,000		$ 5,700,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Line Items]
Warrants and Rights Outstanding									6,000,000.0
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Debt Securities, Available-for-sale [Line Items]
Warrants and Rights Outstanding									5,400,000
Original Statement [Member]
Debt Securities, Available-for-sale [Line Items]
Revenues			$ 53,505	$ 53,190	$ 53,382	$ 53,611	$ 53,551	$ 50,546		214,990
Cost of Goods and Services Sold			52,903	53,568	52,878	54,782	53,195	47,838		210,783
Gross Profit			602	(378)	504	(1,171)	356	2,708		4,207
General and Administrative Expense			1,061	1,174	1,502	1,809	1,056	1,378		4,972
Interest Income (Expense), Net			292	215	169	265	135	149		1,372
Net Income (Loss) Attributable to Parent			$ (751)	$ (1,767)	$ (1,167)	$ (3,245)	$ (835)	$ 1,181		$ (2,137)
Earnings Per Share, Basic | $ / shares			$ (56.35)	$ (132.59)	$ (87.57)	$ (243.49)	$ (62.65)	$ 88.62		$ (160.35)
Earnings Per Share, Diluted | $ / shares			$ (56.35)	$ (132.59)	$ (87.57)	$ (243.49)	$ (62.65)	$ 82.09		$ (160.35)
Cash			$ 1,076	$ 1,101	$ 1,042	$ 1,207	$ 1,275	$ 2,489		$ 1,440
Accounts and Other Receivables, Net, Current			7,636	9,776	9,909	14,584	12,945	11,601		12,672
Inventory, Net			19,848	17,278	13,650	13,547	13,176	13,176		13,526
Other Assets, Current			3,996	1,533	1,164	902	1,531	1,204		1,387
Assets, Current			32,556	29,688	25,765	30,240	28,927	28,470		29,025
Property, Plant and Equipment, Net			109,957	107,697	109,714	113,729	114,655	115,237		111,868
Other Assets, Noncurrent			1,447	1,447	1,738	2,102	2,107	2,101		1,738
Assets			143,960	138,832	137,217	146,071	145,689	145,808		142,631
Accounts Payable and Accrued Liabilities, Current			15,887	9,850	17,110	11,569	7,108	21,250		12,147
Long-term Debt, Current Maturities			2,077	3,571	5,065	6,554	6,549	5,043		6,560
Liabilities, Current			17,964	13,421	22,175	18,123	13,657	26,293		18,707
Long-term Debt, Excluding Current Maturities			30,139	28,803	13,018	25,519	26,358	13,007		20,733
Members' Capital			87,165	87,165	87,165	87,165	87,165	87,165		87,165
Retained Earnings (Accumulated Deficit)			8,692	9,443	14,859	15,264	18,509	19,343		16,026
Liabilities and Equity			143,960	138,832	137,217	146,071	145,689	145,808		142,631
Restatement [Member]
Debt Securities, Available-for-sale [Line Items]
Revenues			53,505	53,190	53,382	53,611	53,551	50,546		214,990
Cost of Goods and Services Sold			52,903	53,617	53,020	54,924	53,337	47,980		211,350
Gross Profit			602	(427)	362	(1,313)	214	2,566		3,640
General and Administrative Expense			1,061	1,174	1,502	1,809	1,056	1,378		4,972
Interest Income (Expense), Net			292	215	169	265	135	149		1,372
Net Income (Loss) Attributable to Parent			$ (751)	$ (1,816)	$ (1,309)	$ (3,387)	$ (977)	$ 1,039		$ (2,704)
Earnings Per Share, Basic | $ / shares			$ (56.35)	$ (136.26)	$ (98.22)	$ (254.15)	$ (73.31)	$ 77.96		$ (202.9)
Earnings Per Share, Diluted | $ / shares			$ (56.35)	$ (136.26)	$ (98.22)	$ (254.15)	$ (73.31)	$ 72.22		$ (202.9)
Cash			$ 1,076	$ 1,101	$ 1,042	$ 1,207	$ 1,275	$ 2,489		$ 1,440
Accounts and Other Receivables, Net, Current			7,636	9,776	9,909	14,584	12,945	11,601		12,672
Inventory, Net			19,848	17,278	13,650	13,547	13,176	13,176		13,526
Other Assets, Current			3,996	1,533	1,164	902	1,531	1,204		1,387
Assets, Current			32,556	29,688	25,765	30,240	28,927	28,470		29,025
Property, Plant and Equipment, Net			109,957	107,697	109,714	113,729	114,655	115,237		111,868
Other Assets, Noncurrent			1,447	1,447	1,738	2,102	2,107	2,101		1,738
Assets			143,960	138,832	137,217	146,071	145,689	145,808		142,631
Accounts Payable and Accrued Liabilities, Current			17,687	11,650	17,964	11,569	7,108	21,250		12,147
Long-term Debt, Current Maturities			2,077	3,571	5,065	6,554	6,549	5,043		6,560
Liabilities, Current			19,764	15,221	23,029	18,123	13,657	26,293		18,707
Long-term Debt, Excluding Current Maturities			33,919	32,583	17,695	30,767	31,464	17,971		26,122
Members' Capital			87,165	87,165	87,165	87,165	87,165	87,165		87,165
Retained Earnings (Accumulated Deficit)			3,112	3,863	9,328	10,016	13,403	14,379		10,637
Liabilities and Equity			$ 143,960	$ 138,832	$ 137,217	$ 146,071	$ 145,689	$ 145,808		142,631
Restatement Adjustment [Member]
Debt Securities, Available-for-sale [Line Items]
Revenues										0
Cost of Goods and Services Sold										567
Gross Profit										(567)
General and Administrative Expense										0
Interest Income (Expense), Net										0
Net Income (Loss) Attributable to Parent										$ (567)
Earnings Per Share, Basic | $ / shares										$ (42.55)
Earnings Per Share, Diluted | $ / shares										$ (42.55)
Cash										$ 0
Accounts and Other Receivables, Net, Current										0
Inventory, Net										0
Other Assets, Current										0
Assets, Current										0
Property, Plant and Equipment, Net										0
Other Assets, Noncurrent										0
Assets										0
Accounts Payable and Accrued Liabilities, Current										0
Long-term Debt, Current Maturities										0
Liabilities, Current										0
Long-term Debt, Excluding Current Maturities										5,389
Members' Capital										0
Retained Earnings (Accumulated Deficit)										(5,389)
Liabilities and Equity										$ 0
Capital Unit, Class A [Member]
Debt Securities, Available-for-sale [Line Items]
Stockholders' Equity, Period Increase (Decrease)									$ 5,100,000
Subsequent Event [Member]
Debt Securities, Available-for-sale [Line Items]
Payments for Repurchase of Common Stock	$ 11,100,000
Decrease (Increase) in Put Warrant Liability		$ 6,000,000.0
Weighted Average Number of Shares Outstanding, Basic | shares	12,309
Operating Lease, Right-of-Use Asset											$ 8,200,000