Note 1 - Organization and Operation - Hashdex Bitcoin Futures ETF (Details Textual)		1 Months Ended	9 Months Ended
	Sep. 15, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	[1]
Stock Issued During Period, Value, New Issues			$ 140,135,089	$ 1,216,204,797
Hashdex Bitcoin Futures ETF [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	50,000	50,004	10,000
Stock Issued During Period, Value, New Issues	$ 1,250,000	$ 1,250,100	$ 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			0.1

[1] The Hashdex Bitcoin Futures ETF commenced operations on September 15, 2022.