Note 1 - Organization and Operation - Hashdex Bitcoin Futures ETF (Details Textual)			4 Months Ended	12 Months Ended
	Sep. 16, 2022 USD ($) $ / shares shares	Sep. 15, 2022 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Stock Issued During Period, Value, New Issues				$ 1,251,138,564	$ 176,346,175	$ 305,719,849
Hashdex Bitcoin Futures ETF [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	50,000	50,000	100,004
Stock Issued During Period, Value, New Issues	$ 1,250,000	$ 1,250,000	$ 2,461,340
Shares Issued, Price Per Share (in dollars per share) | $ / shares	$ 25
Number of Futures Contracts Offered			2	2
Hashdex Bitcoin Futures ETF [Member] | BTC Contracts [Member]
Number of Bitcoin in Contract			5	5
Hashdex Bitcoin Futures ETF [Member] | MBT Contracts [Member]
Number of Bitcoin in Contract			0.10	0.10