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Note 10 - Investment Valuation (Tables)

9 Months Ended

Sep. 30, 2025

Notes Tables

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]

		Level 1				Level 2				Level 3				Total
September 30, 2025
Futures contracts(a)		$	6,966,849			$	—			$	—			$	6,966,849
U.S. Treasury bills			—				999,246,373				—				999,246,373
December 31, 2024
Futures contracts(a)		$	32,609,106			$	—			$	—			$	32,609,106
U.S. Treasury bills			—				963,610,158				—				963,610,158

X

- Definition

Tabular disclosure of investments in certain entities that calculate net asset value per share or equivalent measured at fair value on a recurring or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 54B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482134/820-10-35-54B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

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- References

No definition available.

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