Note 2 - Principal Contracts and Agreements - Hashdex Bitcoin Futures ETF (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Schedule of Related Party Expenses [Table Text Block]

	Year Ended December 31, 2022		Year Ended December 31, 2021		Year Ended December 31, 2020
Amount Recognized for Custody Services	$	410,660	$	363,000	$	369,293
Amount of Custody Services Waived	$	42,625	$	120,850	$	71,342
Amount Recognized for Distribution Services	$	200,313	$	186,531	$	180,024
Amount of Distribution Services Waived	$	48,593	$	94,724	$	68,140
Amount Recognized for Wilmington Trust	$	3,300	$	3,300	$	3,300
Amount of Wilmington Trust Waived	$	550	$	991	$	2,215
Amount Recognized for Thales	$	278,958	$	297,222	$	116,901
Amount of Thales Waived	$	106,944	$	153,198	$	57,988

Hashdex Bitcoin Futures ETF [Member]

Notes Tables

Schedule of Related Party Expenses [Table Text Block]

	Period Ended December 31, 2022
Amount Recognized for Custody Services	$	213
Amount of Custody Services Waived	$	213
Amount Recognized for Distribution Services	$	95
Amount of Distribution Services Waived	$	95
Amount Recognized for Wilmington Trust	$	550
Amount of Wilmington Trust Waived	$	550