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Note 6 - Financial Highlights - Schedule of Per Share Performance Data and Other Supplemental Financial Data - Hashdex Bitcoin Futures ETF (Details) - Hashdex Bitcoin Futures ETF [Member] - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Net asset value per share at beginning of period (in dollars per share) $ 36.76 $ 21.40
Income from investment operations:    
Investment income (in dollars per share) 0.37 0.64
Net realized and unrealized (loss) gain on commodity futures contracts (in dollars per share) 1.73 16.89
Total expenses, net (in dollars per share) (0.08) (0.15)
Net (decrease) increase in net asset value (in dollars per share) 2.02 17.38
Net asset value per share at end of period (in dollars per share) $ 38.78 $ 38.78
Total Return 5.46% 81.16%
Ratios to Average Net Assets (Annualized)    
Total expenses 12.67% 15.87%
Total expenses, net 0.94% 0.94%
Net investment income (loss) 3.18% 3.02%