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Debt (Narrative - Ethanol Production, Partnership Segment, Covenant Compliance, And Restricted Net Assets) (Details)			3 Months Ended	9 Months Ended
		Oct. 15, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) item $ / shares	Sep. 03, 2020 USD ($)	Jun. 04, 2020 USD ($)	Jun. 03, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Restricted assets			$ 67,500,000	$ 67,500,000
Outstanding balance			386,449,000	$ 386,449,000				$ 381,365,000
Green Plains Wood River and Green Plains Shenandoah [Member] | $75.0 Million Delayed Draw Loan Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, draw period				18 months
Debt instrument, face amount			$ 75,000,000.0	$ 75,000,000.0	$ 75,000,000.0
Interest rate, stated percentage			5.02%	5.02%
Interest rate premium			1.50%	1.50%
Debt maturity dates				Sep. 01, 2035
Minimum working capital required for compliance, per gallon				0.10%
Minimum working capital required for compliance				$ 112,300,000
Minimum loan to value ratio, percent				50.00%
Fixed charge coverage ratio			1.25	1.25
Debt service reserve term of future payments				6 months
Annual principal payments			$ 1,500,000	$ 1,500,000
Months before first payment after closing				24 months
Outstanding balance	[1]		$ 10,000,000	$ 10,000,000
Green Plains Wood River and Green Plains Shenandoah [Member] | $75.0 Million Delayed Draw Loan Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Unused capacity fee, percentage				0.00%
Green Plains Wood River and Green Plains Shenandoah [Member] | $75.0 Million Delayed Draw Loan Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Unused capacity fee, percentage				1.50%
Partnership [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Unused capacity fee, percentage				0.50%
Debt instrument, face amount						$ 135,000,000.0	$ 200,000,000.0
Debt maturity dates				Dec. 31, 2021
Consolidated net leverage ratio decrease each quarter			0.25	0.25
Line of credit, threshold of cash balance, payment required			$ 2,500,000	$ 2,500,000
Line of credit, theshold cash balance, number of consecutive business days | item				5
Line of credit, percent of net cash proceeds required for outstanding principal				100.00%
Line of credit terms, maximum per unit quarterly payments | $ / shares				$ 0.12
Partnership [Member] | Expected By Fourth Quarter Of 2021 [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated net leverage ratio			1.50	1.50
Partnership [Member] | Minimum [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate, basis for effective rate				1.0%
Consolidated debt service coverage ratio			1.1	1.1
Partnership [Member] | Minimum [Member] | LIBOR [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate, basis spread on variable rate, percentage				4.50%
Partnership [Member] | Maximum [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Consolidated net leverage ratio			3.0	3.0
Partnership [Member] | Maximum [Member] | LIBOR [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate, basis spread on variable rate, percentage				5.25%
Partnership [Member] | Revolving Credit Facility [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 5,000,000.0	$ 5,000,000.0
Debt instrument, term				10 days
Interest rate, effective percentage			7.25%	7.25%
Outstanding balance			$ 700,000	$ 700,000
Partnership [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Prime Rate [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate, basis spread on variable rate, percentage				3.50%
Partnership [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Prime Rate [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate, basis spread on variable rate, percentage				4.25%
Partnership [Member] | Term Loan [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 130,000,000.0	$ 130,000,000.0
Interest rate, effective percentage			6.00%	6.00%
Payments on credit facility			$ 12,500,000	$ 12,500,000
Debt Instrument, Date of First Required Payment				Oct. 15, 2020
Outstanding balance			$ 117,500,000	$ 117,500,000
Partnership [Member] | Term Loan [Member] | Term Loan, Payments Beginning In May 15, 2021 [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Principal payments (plus interest)				$ 3,200,000
Subsequent Event [Member] | Partnership [Member] | Term Loan [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Scheduled periodic principal payments		$ 2,500,000
[1] On September 3, 2020, Green Plains Wood River and Green Plains Shenandoah, wholly-owned subsidiaries of the company, entered into a $75.0 million delayed draw loan agreement. The delayed draw loan includes $0.3 million of unamortized debt issuance costs as of September 30, 2020.

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