Commitments and Contingencies (Narrative) (Details) $ in Thousands, gal in Millions				3 Months Ended
	Mar. 22, 2021 gal	Mar. 21, 2021 gal	Jul. 01, 2020 $ / gal	Mar. 31, 2022 USD ($) $ / gal gal	Jun. 30, 2021 gal
Other Commitments [Line Items]
Undiscounted future lease payments | $				$ 3,210
Green Plains Trade [Member]
Other Commitments [Line Items]
Quarterly minimum volume commitment, throughput capacity (in gallons) | gal	217.7	232.5		217.7
Fee-based Storage and Throughput Agreement [Member] | Green Plains Trade [Member]
Other Commitments [Line Items]
Agreement rate, price per gallon | $ / gal			0.05	0.05312
Quarterly minimum volume commitment, throughput capacity (in gallons) | gal		232.5			217.7
Lessor, Operating Lease, Term of Contract				7 years 3 months 18 days
Lessor, Operating Lease, Renewal Term				1 year
Minimum [Member]
Other Commitments [Line Items]
Operating lease remaining lease term				1 year
Maximum [Member]
Other Commitments [Line Items]
Operating lease remaining lease term				9 years 7 months 6 days
Additional Railcar Operating Leases [Member]
Other Commitments [Line Items]
Lessor, Operating Lease, Term of Contract				4 years
Undiscounted future lease payments | $				$ 1,700
Amended Rail Transportation Services Agreement [Member]
Other Commitments [Line Items]
Lessor, Operating Lease, Term of Contract				4 years 8 months 12 days
Lessor, Operating Lease, Renewal Term				1 year