Represents the period of worth of debt for which the entity is required to make deposits regarding debt instruments.

No definition available.

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Namespace Prefix:	gfe_
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Balance Type:	na
Period Type:	duration

- Definition

The amount of the deposit on debt service payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	gfe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=gfe_ProjectHawkeyeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gfe_GraniteFallsEnergyLlcExcludingHeronLakeBioenergyLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gfe_PaycheckProtectionProgramLoanMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gfe_HeronLakeBioEnergyLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gfe_RevolvingNotesPayableToLendingInstitutionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gfe_SingleAdvanceTermNotePayableToLendingInstitutionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gfe_AssessmentsPayable6.55PercentDue2021Member
Namespace Prefix:
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Balance Type:
Period Type:

DEBT FACILITIES (Details) - USD ($)	9 Months Ended	12 Months Ended
DEBT FACILITIES (Details) - USD ($)	Jul. 31, 2020	Oct. 31, 2019	Jun. 30, 2020	Apr. 18, 2020	Apr. 17, 2020
Line of Credit Facility
Long-term Debt	$ 13,645,020	$ 8,044,894
Less: amounts due within one year	2,703,479	1,405,406
Net long term debt	10,941,541	6,639,488
Term note payable to Project Hawkeye \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	6,607,143	7,410,714
SBA Paycheck Protection Loan \| Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	703,900
Interest rate (as a percent)					1.00%
SBA Paycheck Protection Loan \| Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	595,693
Interest rate (as a percent)				1.00%
Amended revolving term note payable to lending institution \| Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	2,270,918
Single advance term note payable to lending institution \| Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	3,000,000
Interest rate (as a percent)			3.80%
Assessments payable as part of water treatment agreement, with interest at 6.55%, due in 2021 \| Heron Lake BioEnergy, LLC
Line of Credit Facility
Long-term Debt	467,366	634,180
Payment	$ 189,393	$ 189,393
Interest rate (as a percent)	6.55%	6.55%
Period of worth of debt	1 year	1 year
Deposit on debt service payments	$ 364,000	$ 364,000