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Related parties – Sponsor and Trustee (Details Narrative)	6 Months Ended
	Dec. 31, 2023 USD ($)
Related Party Transactions [Abstract]
Legal fees and expenses	$ 100,000
Fee paid to sponsor percentage	0.1749%

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
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

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

X

- References

No definition available.

+ Details

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