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Debt (Narrative - Ethanol Production, Partnership Segment, Covenant Compliance, And Restricted Net Assets) (Details) |  | 1 Months Ended | 12 Months Ended |  |  |
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Oct. 15, 2020 USD ($) | Jun. 30, 2013 USD ($) item | Dec. 31, 2020 USD ($) item $ / shares | Dec. 31, 2019 USD ($) | Sep. 03, 2020 USD ($) | Jun. 04, 2020 USD ($) | Jun. 03, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Restricted assets |  |  |  | $ 77,700,000 |  |  |  |
Outstanding balance |  |  |  | $ 391,502,000 | $ 381,365,000 |  |  |
Birmingham BioEnergy Partners LLC Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Two promissory notes payable | item |  |  | 2 |  |  |  |  |
Birmingham BioEnergy Partners LLC Member] | Notes Receivable [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Note receivable |  |  | $ 8,100,000 |  | 8,100,000 |  |  |
Birmingham BioEnergy Partners LLC Member] | Notes Payable to Banks [Member] | Promissory Note [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 10,000,000.0 |  |  |
Birmingham BioEnergy Partners LLC Member] | Notes Payable to Banks [Member] | Promissory Note I [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 1,900,000 |  | 1,900,000 |  |  |
Birmingham BioEnergy Partners LLC Member] | Notes Payable to Banks [Member] | Promissory Note II [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 8,100,000 |  |  |  |  |
Debt amount forgiven |  |  |  |  | 8,100,000 |  |  |
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% |  |  |  |
Interest rate premium |  |  |  | 1.50% |  |  |  |
Debt maturity dates |  |  |  | Sep. 01, 2035 |  |  |  |
Minimum working capital required for compliance, per gallon |  |  |  | 0.10% |  |  |  |
Minimum working capital required for compliance |  |  |  | $ 102,300,000 |  |  |  |
Minimum loan to value ratio, percent |  |  |  | 50.00% |  |  |  |
Fixed charge coverage ratio |  |  |  | 1.25 |  |  |  |
Debt service reserve term of future payments |  |  |  | 6 months |  |  |  |
Annual principal payments |  |  |  | $ 1,500,000 |  |  |  |
Months before first payment after closing |  |  |  | 24 months |  |  |  |
Outstanding balance | [1] |  |  | $ 30,000,000 |  |  |  |
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% |  |  |  |
Green Plains Partners [Member] | Hereford Ethanol Plant [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Payments on credit facility |  |  |  | $ 10,000,000.0 |  |  |  |
Green Plains Partners [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unused capacity fee, percentage |  |  |  | 0.50% |  |  |  |
Benchmark of prepayments in excess of scheduled monthly payments |  |  |  | $ 40,000,000.0 |  |  |  |
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 |  |  |  |
Line of credit, threshold of cash balance, payment required |  |  |  | $ 2,500,000 |  |  |  |
Threshold 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 |  |  |  |
Green Plains Partners [Member] | Expected By Fourth Quarter Of 2021 [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Consolidated net leverage ratio |  |  |  | 1.50 |  |  |  |
Green Plains Partners [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 |  |  |  |
Green Plains Partners [Member] | Minimum [Member] | If Less Than $40 Million In Prepayments Prior To April 1, 2021 [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis for effective rate |  |  |  | 1.00% |  |  |  |
Green Plains Partners [Member] | Minimum [Member] | LIBOR [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis spread on variable rate, percentage |  |  |  | 4.50% |  |  |  |
Green Plains Partners [Member] | Minimum [Member] | LIBOR [Member] | If Less Than $40 Million In Prepayments Prior To April 1, 2021 [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis spread on variable rate, percentage |  |  |  | 5.00% |  |  |  |
Green Plains Partners [Member] | Maximum [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Consolidated net leverage ratio |  |  |  | 3.0 |  |  |  |
Green Plains Partners [Member] | Maximum [Member] | LIBOR [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis spread on variable rate, percentage |  |  |  | 5.25% |  |  |  |
Green Plains Partners [Member] | Maximum [Member] | LIBOR [Member] | If Less Than $40 Million In Prepayments Prior To April 1, 2021 [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis spread on variable rate, percentage |  |  |  | 5.75% |  |  |  |
Green Plains Partners [Member] | Revolving Credit Facility [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 5,000,000.0 |  |  |  |
Debt instrument, term |  |  |  | 10 years |  |  |  |
Outstanding balance |  |  |  | $ 0 |  |  |  |
Green Plains Partners [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% |  |  |  |
Green Plains Partners [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% |  |  |  |
Green Plains Partners [Member] | Term Loan [Member] | Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis for effective rate |  |  |  | 6.00% |  |  |  |
Debt instrument, face amount |  |  |  | $ 130,000,000.0 |  |  |  |
Payments on credit facility |  |  |  | $ 30,000,000.0 |  |  |  |
Scheduled periodic principal payments |  | $ 2,500,000 |  |  |  |  |  |
Debt Instrument, Date of First Required Payment |  |  |  | Oct. 15, 2020 |  |  |  |
Outstanding balance |  |  |  | $ 100,000,000.0 |  |  |  |
Green Plains Partners [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 |  |  |  |
[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 December 31, 2020.

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