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Related parties – Sponsor and Trustee (Details Narrative)	9 Months Ended
	Mar. 31, 2022 USD ($)
Fee paid to sponsor percentage	0.1749%
Maximum [Member]
Legal fees and expenses	$ 100,000

X

- Definition

The percent of the adjusted daily net asset value of the Trust used in computing fees paid to Sponsor,

+ References

No definition available.

+ Details

Name:	BAR_FeePaidToSponsor
Namespace Prefix:	BAR_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

+ Details

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

X

- Details

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