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Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value - Hashdex Bitcoin Futures ETF (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Cash Equivalents $ 263,945,542 $ 388,000,477
Total 265,812,434 396,207,858
Bitcoin Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 126,672 29,152
Hashdex Bitcoin Futures ETF [Member]    
Cash Equivalents 1,414,157 701,969
Total 1,540,829 731,121
Hashdex Bitcoin Futures ETF [Member] | Bitcoin Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 126,672 29,152
Fair Value, Inputs, Level 1 [Member]    
Cash Equivalents 263,945,542 388,000,477
Total 265,812,434 396,207,858
Fair Value, Inputs, Level 1 [Member] | Bitcoin Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 126,672 29,152
Fair Value, Inputs, Level 1 [Member] | Hashdex Bitcoin Futures ETF [Member]    
Cash Equivalents 1,414,157 701,969
Total 1,540,829 731,121
Fair Value, Inputs, Level 1 [Member] | Hashdex Bitcoin Futures ETF [Member] | Bitcoin Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 126,672 29,152
Fair Value, Inputs, Level 2 [Member]    
Cash Equivalents 0 0
Total 0 0
Fair Value, Inputs, Level 2 [Member] | Bitcoin Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 0 0
Fair Value, Inputs, Level 2 [Member] | Hashdex Bitcoin Futures ETF [Member]    
Cash Equivalents 0 0
Total 0 0
Fair Value, Inputs, Level 2 [Member] | Hashdex Bitcoin Futures ETF [Member] | Bitcoin Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 0 0
Fair Value, Inputs, Level 3 [Member]    
Cash Equivalents 0 0
Total 0 0
Fair Value, Inputs, Level 3 [Member] | Bitcoin Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 0 0
Fair Value, Inputs, Level 3 [Member] | Hashdex Bitcoin Futures ETF [Member]    
Cash Equivalents 0 0
Total 0 0
Fair Value, Inputs, Level 3 [Member] | Hashdex Bitcoin Futures ETF [Member] | Bitcoin Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts $ 0 $ 0