Note 2 - Principal Contracts and Agreements - Hashdex Bitcoin Futures ETF (Details Textual)	6 Months Ended
Jun. 30, 2023 USD ($)
U.S. Bank N.A. [Member] \| Custody Services [Member]
Related Party Transaction, Percentage of Average Gross Assets, Up to One Billion	0.0075%
Related Party Transaction, Percentage of Average Gross Assets, Over One Billion	0.005%
U.S. Bank N.A. [Member] \| Custody Services [Member] \| Hashdex Bitcoin Futures ETF [Member]
Related Party Transaction, Percentage of Average Gross Assets, Up to One Billion	0.0075%
Related Party Transaction, Percentage of Average Gross Assets, Over One Billion	0.005%
Global Fund Services [Member] \| Transfer Agency, Fund Accounting and Fund Administration Services [Member]
Related Party Transaction, Percentage of Average Gross Assets, First 500 Million	0.05%
Related Party Transaction, Percentage of Average Gross Assets, Second 500 Million	0.04%
Related Party Transaction, Percentage of Average Gross Assets, Next Two Billion	0.03%
Related Party Transaction, Percentage of Average Gross Assets, Over Three Billion	0.02%
Global Fund Services [Member] \| Transfer Agency, Fund Accounting and Fund Administration Services [Member] \| Hashdex Bitcoin Futures ETF [Member]
Related Party Transaction, Percentage of Average Gross Assets, First 500 Million	0.05%
Related Party Transaction, Percentage of Average Gross Assets, Second 500 Million	0.04%
Related Party Transaction, Percentage of Average Gross Assets, Next Two Billion	0.03%
Related Party Transaction, Percentage of Average Gross Assets, Over Three Billion	0.02%
U.S. Bank N.A. and Global Fund Services [Member] \| Custody, Transfer Agency, Fund Accounting and Fund Administration Services [Member]
Related Party Transaction, Minimum Annual Fee Per Fund	$ 47,000
U.S. Bank N.A. and Global Fund Services [Member] \| Custody, Transfer Agency, Fund Accounting and Fund Administration Services [Member] \| Hashdex Bitcoin Futures ETF [Member]
Related Party Transaction, Minimum Annual Fee Per Fund	$ 47,000
Foreside Fund Services, LLC [Member] \| Distribution Services Agreement [Member]
Related Party Transaction, Percentage of Average Daily Net Assets	0.01%
Related Party Transaction, Aggregate Annual Fee for all Funds	$ 100,000
Foreside Fund Services, LLC [Member] \| Distribution Services Agreement [Member] \| Hashdex Bitcoin Futures ETF [Member]
Related Party Transaction, Percentage of Average Daily Net Assets	0.01%
Related Party Transaction, Aggregate Annual Fee for all Funds	$ 100,000
StoneX Financial Inc [Member] \| Brokerage Commissions [Member] \| Minimum [Member]
Related Party Transaction, Fee Per Half Turn	10.00
StoneX Financial Inc [Member] \| Brokerage Commissions [Member] \| Maximum [Member]
Related Party Transaction, Fee Per Half Turn	25.00
StoneX Financial Inc [Member] \| Brokerage Commissions [Member] \| Hashdex Bitcoin Futures ETF [Member] \| Minimum [Member]
Related Party Transaction, Fee Per Half Turn	10.00
StoneX Financial Inc [Member] \| Brokerage Commissions [Member] \| Hashdex Bitcoin Futures ETF [Member] \| Maximum [Member]
Related Party Transaction, Fee Per Half Turn	25.00
Phillip Capital Inc [Member] \| Brokerage Commissions [Member] \| Minimum [Member]
Related Party Transaction, Fee Per Half Turn	35.00
Phillip Capital Inc [Member] \| Brokerage Commissions [Member] \| Maximum [Member]
Related Party Transaction, Fee Per Half Turn	45.00
Phillip Capital Inc [Member] \| Brokerage Commissions [Member] \| Hashdex Bitcoin Futures ETF [Member] \| Minimum [Member]
Related Party Transaction, Fee Per Half Turn	35.00
Phillip Capital Inc [Member] \| Brokerage Commissions [Member] \| Hashdex Bitcoin Futures ETF [Member] \| Maximum [Member]
Related Party Transaction, Fee Per Half Turn	45.00
Wilmington Trust Company [Member]
Related Party Transaction, Annual Fee	3,300
Wilmington Trust Company [Member] \| Hashdex Bitcoin Futures ETF [Member]
Related Party Transaction, Annual Fee	$ 3,300

The amount of aggregate annual fee for all funds of the related party transaction.

No definition available.

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- Definition

Amount of annual fee to related party.

+ References

No definition available.

+ Details

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- Definition

Amount of fee per half turn in related party transaction.

+ References

No definition available.

+ Details

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- Definition

The minimum annual fee per fund for related party transaction.

+ References

No definition available.

+ Details

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- Definition

Percentage of average daily net assets for related party transaction.

+ References

No definition available.

+ Details

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- Definition

Percentage of average gross assets on the first 500 million for related party transaction.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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- Definition

Percentage of average gross assets on the next 2 billion for related party transaction.

+ References

No definition available.

+ Details

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- Definition

Percentage of average gross assets over one billion for related party transaction.

+ References

No definition available.

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Data Type:	dtr-types:percentItemType
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- Definition

Percentage of average gross assets on over 3 billion for related party transaction.

+ References

No definition available.

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Data Type:	dtr-types:percentItemType
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- Definition

Percentage of average gross assets on the second 500 million for related party transaction.

+ References

No definition available.

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- Definition

Percentage of average gross assets up to one billion for related party transaction.

+ References

No definition available.

+ Details

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- Details

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- Details

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