Amount of estimated rehabilitation cost

No definition available.

Name:	hlb_EstimatedCostOfRehabilitation
Namespace Prefix:	hlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number Of Hopper Rail Cars Leased

+ References

No definition available.

+ Details

Name:	hlb_NumberOfHopperRailCarsLeased
Namespace Prefix:	hlb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of rehabilitation cost incurred during the period.

+ References

No definition available.

+ Details

Name:	hlb_RehabilitationCost
Namespace Prefix:	hlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- 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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=hlb_CornForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=hlb_EthanolForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=hlb_DistillersGrainsForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=hlb_CornOilForwardContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=hlb_RailCarRehabilitationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

COMMITMENTS AND CONTINGENCIES (Details)	3 Months Ended	9 Months Ended	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details)	Jul. 31, 2020 USD ($)	Jul. 31, 2020 USD ($) item bu	Oct. 31, 2019 USD ($)
COMMITMENTS AND CONTINGENCIES
Impairment charge		$ 1,000,000
Commodity Contract
COMMITMENTS AND CONTINGENCIES
Impairment charge		$ 824,000	$ 0
Corn Forward Contracts \| Long/Purchase
COMMITMENTS AND CONTINGENCIES
Notional volume \| bu		4,613,000
Ethanol Forward Contracts \| Short/Sale
COMMITMENTS AND CONTINGENCIES
Notional value	$ 6,069,000	$ 6,069,000
Distillers Grains Forward Contracts \| Short/Sale
COMMITMENTS AND CONTINGENCIES
Notional value	325,000	325,000
Corn Oil Forward Contract \| Short/Sale
COMMITMENTS AND CONTINGENCIES
Notional value	701,000	$ 701,000
Rail Car Rehabilitation Agreement
COMMITMENTS AND CONTINGENCIES
Number of hopper rail cars leased \| item		50
Estimated total costs to rehabilitate the cars		$ 585,000	$ 551,000
Rail Car Rehabilitation Agreement \| Cost of goods sold
COMMITMENTS AND CONTINGENCIES
Rehabilitation Cost	$ 16,000	$ 70,000