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Note 3 - Summary of Significant Accounting Policies - Total Brokerage Commissions Paid - Hashdex Bitcoin Futures ETF (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
[1]
Jun. 30, 2023
Jun. 30, 2022
[1]
Brokerage Commissions $ 49,718 $ 329,754 $ 101,736 $ 454,860
Hashdex Bitcoin Futures ETF [Member]        
Brokerage Commissions $ 769 $ 0 $ 1,377 $ 0
[1] The Hashdex Bitcoin Futures ETF commenced operations on September 15, 2022.