Lease commencement date.

No definition available.

Name:	hgbl_LeaseCommencementDate
Namespace Prefix:	hgbl_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Lease terminated date.

+ References

No definition available.

+ Details

Name:	hgbl_LeaseTerminatedDate
Namespace Prefix:	hgbl_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Lessee operating lease, incremental borrowing rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	hgbl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of locations.

+ References

No definition available.

+ Details

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Namespace Prefix:	hgbl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of land subject to a ground lease.

+ References

No definition available.

+ Details

Name:	us-gaap_LandSubjectToGroundLeases
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseRemainingLeaseTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

+ Details

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

- Definition

Cash payments to lessor's for use of assets under operating leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForRent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=hgbl_BurlingameCAMember
Namespace Prefix:
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Leases (Narrative) (Details) $ in Thousands		6 Months Ended
Leases (Narrative) (Details) $ in Thousands	Oct. 27, 2020 USD ($) ft²	Jun. 30, 2021 USD ($) Location	Jun. 30, 2020 USD ($)	Apr. 01, 2021	Jan. 01, 2019
Number of locations \| Location		3
Lessee operating lease, incremental borrowing rate				4.95%	5.25%
Lease expense		$ 300	$ 300
Hayward F G H K Industrial L L C
Area of lease \| ft²	30,321
Lease commencement date	Apr. 01, 2021
Initial term for lease	90 months
Initial monthly base rent	$ 27,289
Hayward F G H K Industrial L L C \| Maximum [Member]
Initial monthly base rent	$ 33,562
Burlingame C A
Lease terminated date		Apr. 30, 2021