Note 5 - Derivative Instruments and Hedging Activities - Offsetting of Financial Assets and Liabilities and Derivative Assets and Liabilities - Hashdex Bitcoin Futures ETF (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Gross amount of recognized assets	$ 2,237,493
Gross amount offset, assets	0
Derivative asset	2,237,493
Available for offset, assets	2,237,493
Collateral, due to broker, assets	0
Net amount, assets	0
Derivative liabilities	10,888,842	$ 29,433,069
Available for offset, assets	2,237,493
Bitcoin Futures Contracts [Member]
Gross amount of recognized assets	129,519	29,152
Gross amount offset, assets	0	0
Derivative asset	129,519	29,152
Available for offset, assets	51,376	0
Collateral, due to broker, assets	0	0
Net amount, assets	78,143	29,152
Gross amount of recognized liabilities	51,376
Gross amount offset, liabilities	0
Derivative liabilities	51,376
Futures contracts available for offset, liabilities	51,376
Collateral, due from broker, liabilities	0
Net amount, liabilities	0
Available for offset, assets	51,376	0
Bitcoin Futures Contracts [Member] | Hashdex Bitcoin Futures ETF [Member]
Gross amount of recognized assets	129,519	29,152
Gross amount offset, assets	0	0
Derivative asset	129,519	29,152
Available for offset, assets	51,376	0
Collateral, due to broker, assets	0	0
Net amount, assets	78,143	29,152
Gross amount of recognized liabilities	51,376
Gross amount offset, liabilities	0
Derivative liabilities	51,376
Futures contracts available for offset, liabilities	51,376
Collateral, due from broker, liabilities	0
Net amount, liabilities	0
Available for offset, assets	$ 51,376	$ 0