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Note 5 - Derivative Instruments and Hedging Activities - Offsetting of Financial Assets and Liabilities and Derivative Assets and Liabilities - Hashdex Bitcoin Futures ETF (Details) - Bitcoin Futures Contracts [Member] - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Gross amount of recognized assets $ 126,672 $ 29,152
Gross amount offset, assets 0 0
Derivative asset 126,672 29,152
Available for offset, assets 0 0
Collateral, due to broker, assets 0 0
Net amount, assets 126,672 29,152
Available for offset, assets 0 0
Hashdex Bitcoin Futures ETF [Member]    
Gross amount of recognized assets 126,672 29,152
Gross amount offset, assets 0 0
Derivative asset 126,672 29,152
Available for offset, assets 0 0
Collateral, due to broker, assets 0 0 [1]
Net amount, assets 126,672 29,152
Available for offset, assets $ 0 $ 0
[1] The amount of collateral presented in Collateral, Due from Broker, is limited to the liability for the futures contracts and accordingly does not include the excess collateral pledged.