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Note 2 - Significant Accounting Policies - Summary of Investments at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Investments, fair value	$ 6,088,852	$ 4,692,387
SPDR Gold Mini Shares Trust [Member]
Investments, fair value	6,088,852	4,692,387
Fair Value, Inputs, Level 1 [Member]
Investments, fair value	6,088,852	4,692,387
Fair Value, Inputs, Level 1 [Member] | SPDR Gold Mini Shares Trust [Member]
Investments, fair value	6,088,852	4,692,387
Fair Value, Inputs, Level 2 [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 2 [Member] | SPDR Gold Mini Shares Trust [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Investments, fair value	0	0
Fair Value, Inputs, Level 3 [Member] | SPDR Gold Mini Shares Trust [Member]
Investments, fair value	0	0
Investment in Gold [Member] | Fair Value, Inputs, Level 1 [Member]
Investments, fair value	6,088,852	4,692,387
Investment in Gold [Member] | Fair Value, Inputs, Level 1 [Member] | SPDR Gold Mini Shares Trust [Member]
Investments, fair value	6,088,852	4,692,387
Investment in Gold [Member] | Fair Value, Inputs, Level 2 [Member]
Investments, fair value	0	0
Investment in Gold [Member] | Fair Value, Inputs, Level 2 [Member] | SPDR Gold Mini Shares Trust [Member]
Investments, fair value	0	0
Investment in Gold [Member] | Fair Value, Inputs, Level 3 [Member]
Investments, fair value	0	0
Investment in Gold [Member] | Fair Value, Inputs, Level 3 [Member] | SPDR Gold Mini Shares Trust [Member]
Investments, fair value	$ 0	$ 0

X

- Definition

Fair value of investment held in physical commodities, for example, but not limited to, gold, silver, platinum, crude oil, coal, sugar, rice, wheat.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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