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Note 1 - Organization and Operation - Hashdex Bitcoin Futures ETF (Details Textual)		6 Months Ended
	Sep. 15, 2022 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 USD ($)	[1]
Stock Issued During Period, Value, New Issues		$ 53,893,829	$ 1,131,712,866
Hashdex Bitcoin Futures ETF [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	50,000	10,000
Stock Issued During Period, Value, New Issues	$ 1,250,000	$ 367,689
Shares Issued, Price Per Share (in dollars per share) | $ / shares	$ 25
Number of Futures Contracts Offered		2
Hashdex Bitcoin Futures ETF [Member] | BTC Contracts [Member]
Number of Bitcoin in Contract		5
Hashdex Bitcoin Futures ETF [Member] | MBT Contracts [Member]
Number of Bitcoin in Contract		0.10
[1] The Hashdex Bitcoin Futures ETF commenced operations on September 15, 2022.

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