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Note 5 - Derivative Instruments and Hedging Activities - Hashdex Bitcoin Futures ETF (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivative, Average Notional Amount $ 324.9 $ 902.8 $ 353.6 $ 690.9
Hashdex Bitcoin Futures ETF [Member]        
Derivative, Average Notional Amount $ 2.1   $ 1.9