Note 2 - Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($) shares	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)
Fair Value Assets and Liabilities, Transfers Between Level One, Level Two and Level Three			$ 0		$ 0
Percentage of Gold Held as Good Delivery Gold Bars	100.00%		100.00%
Maximum Number of Business Days to Transfer Ownership of Gold (Day)			1 day
Minimum Block of Shares Issued Redeemed Against Gold (in shares) \| shares			100,000
Gain (Loss) on Investments	$ 10,388,881	$ 14,352,151	$ 26,023,376	$ 13,823,510
Gain (Loss) on Sale of Trust Assets to Pay Expenses	70,453	24,129	120,193	46,435
Net Realized Gain Loss From Gold Distributed For The Redemption Of Shares	9,038,945	2,484,386	13,783,985	4,637,254
Unrealized Gain (Loss) on Investments	1,279,483	$ 11,843,636	12,119,198	$ 9,139,821
Liability for Uncertainty in Income Taxes, Current	$ 0		$ 0		$ 0
Number of Income Tax Examinations In Progress			0
Income Tax Examination, Description			There were no examinations in progress at period end.

The amount of transfers between level 1, level 2 and level 3 of fair value if assets and liabilities.

No definition available.

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- Definition

The maximum number of days to transfer ownership of gold.

+ References

No definition available.

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- Definition

The minimum block of shares issued for redemption against gold.

+ References

No definition available.

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- Definition

Net realized gain loss from gold distributed for the redemption of shares.

+ References

No definition available.

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- Definition

The number of income tax examinations in progress.

+ References

No definition available.

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- Definition

The percentage of gold held in the form of good delivery gold bars.

+ References

No definition available.

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- Definition

Amount of realized and unrealized gain (loss) on investment.

+ 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(9)(a))
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Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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- Definition

Gain (loss) related to the sale of trust assets (includes, but is not limited to, gold and silver) to pay trust expenses.

+ References

No definition available.

+ Details

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- Definition

A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
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Amount recognized for uncertainty in income taxes classified as current.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of unrealized gain (loss) on investment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 28
-Subparagraph (b)
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-Topic 230
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