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Note 10 - Investment Valuation - Valuation of the Trust's Investments by the Fair Value Hierarchy (Details) - USD ($)		Sep. 30, 2025	Dec. 31, 2024
Futures [Member]
Investment, fair value	[1]	$ 6,966,849	$ 32,609,106
US Treasury Bill Securities [Member]
Investment, fair value		999,246,373	963,610,158
Fair Value, Inputs, Level 1 [Member] | Futures [Member]
Investment, fair value	[1]	6,966,849	32,609,106
Fair Value, Inputs, Level 1 [Member] | US Treasury Bill Securities [Member]
Investment, fair value		0	0
Fair Value, Inputs, Level 2 [Member] | Futures [Member]
Investment, fair value	[1]	0	0
Fair Value, Inputs, Level 2 [Member] | US Treasury Bill Securities [Member]
Investment, fair value		999,246,373	963,610,158
Fair Value, Inputs, Level 3 [Member] | Futures [Member]
Investment, fair value	[1]	0	0
Fair Value, Inputs, Level 3 [Member] | US Treasury Bill Securities [Member]
Investment, fair value		$ 0	$ 0
[1] Shown at the unrealized appreciation (depreciation) on the contracts.

X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 6: 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

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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- Details

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- Details

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