Note 2 - Principal Contracts and Agreements - Summary of Expenses - Hashdex Bitcoin Futures ETF (Details) - USD ($)	4 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amount Recognized		$ 2,721,842	$ 2,321,539	$ 2,279,672
Amount Waived		518,599	1,052,715	775,432
Wilmington Trust Company [Member]
Amount Recognized		3,300	3,300	3,300
Amount Waived		550	991	2,215
Hashdex Bitcoin Futures ETF [Member] | Wilmington Trust Company [Member]
Amount Recognized	$ 550
Amount Waived	550
Custody Services [Member]
Amount Recognized		410,660	363,000	369,293
Amount Waived		42,625	120,850	71,342
Custody Services [Member] | Hashdex Bitcoin Futures ETF [Member]
Amount Recognized	213
Amount Waived	213
Distribution Services [Member]
Amount Recognized		200,313	186,531	180,024
Amount Waived		$ 48,593	$ 94,724	$ 68,140
Distribution Services [Member] | Hashdex Bitcoin Futures ETF [Member]
Amount Recognized	95
Amount Waived	$ 95