Note 6 - Financial Highlights - Schedule of Per Share Performance Data and Other Supplemental Financial Data - Hashdex Bitcoin Futures ETF (Details) - Hashdex Bitcoin Futures ETF [Member] - $ / shares	4 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023
Net asset value per share at beginning of period (in dollars per share)	$ 25	$ 21.4
Income (loss) from investment operations:
Investment income (in dollars per share)	0.19	1.59
Net realized and unrealized (loss) gain on commodity futures contracts (in dollars per share)	(3.73)	28.09
Total expenses, net (in dollars per share)	(0.06)	(0.34)
Net (decrease) increase in net asset value (in dollars per share)	(3.6)	29.34
Net asset value per share at end of period (in dollars per share)	$ 21.4	$ 50.74
Total Return	(14.39%)	137.06%
Ratios to Average Net Assets (Annualized)
Total expenses	17.60%	15.34%
Total expenses, net	0.94%	0.94%
Net investment gain (loss)	1.90%	3.46%