Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value - Hashdex Bitcoin Futures ETF (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Cash Equivalents	$ 263,089,306	$ 388,000,477
Commodity and Cryptocurrency Futures Contracts	2,237,493
Total	265,456,318	396,207,858
Commodity and Cryptocurrency Futures Contracts	10,888,842	29,433,069
Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	263,089,306	388,000,477
Total	265,456,318	396,207,858
Commodity and Cryptocurrency Futures Contracts	10,888,842	29,433,069
Fair Value, Inputs, Level 2 [Member]
Cash Equivalents	0	0
Total	0	0
Commodity and Cryptocurrency Futures Contracts	0	0
Fair Value, Inputs, Level 3 [Member]
Cash Equivalents	0	0
Total	0	0
Commodity and Cryptocurrency Futures Contracts	0	0
Bitcoin Futures Contracts [Member]
Commodity and Cryptocurrency Futures Contracts	129,519	29,152
Commodity and Cryptocurrency Futures Contracts	51,376
Bitcoin Futures Contracts [Member] | Fair Value, Inputs, Level 1 [Member]
Commodity and Cryptocurrency Futures Contracts	129,519	29,152
Commodity and Cryptocurrency Futures Contracts	51,376
Bitcoin Futures Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Commodity and Cryptocurrency Futures Contracts	0	0
Commodity and Cryptocurrency Futures Contracts	0
Bitcoin Futures Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Commodity and Cryptocurrency Futures Contracts	0	0
Commodity and Cryptocurrency Futures Contracts	0
Hashdex Bitcoin Futures ETF [Member]
Cash Equivalents	1,867,663	701,969
Total	1,997,182	731,121
Hashdex Bitcoin Futures ETF [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	1,867,663	701,969
Total	1,997,182	731,121
Hashdex Bitcoin Futures ETF [Member] | Fair Value, Inputs, Level 2 [Member]
Cash Equivalents	0	0
Total	0	0
Hashdex Bitcoin Futures ETF [Member] | Fair Value, Inputs, Level 3 [Member]
Cash Equivalents	0	0
Total	0	0
Hashdex Bitcoin Futures ETF [Member] | Bitcoin Futures Contracts [Member]
Commodity and Cryptocurrency Futures Contracts	129,519	29,152
Commodity and Cryptocurrency Futures Contracts	51,376
Hashdex Bitcoin Futures ETF [Member] | Bitcoin Futures Contracts [Member] | Fair Value, Inputs, Level 1 [Member]
Commodity and Cryptocurrency Futures Contracts	129,519	29,152
Commodity and Cryptocurrency Futures Contracts	51,376
Hashdex Bitcoin Futures ETF [Member] | Bitcoin Futures Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Commodity and Cryptocurrency Futures Contracts	0	0
Commodity and Cryptocurrency Futures Contracts	0
Hashdex Bitcoin Futures ETF [Member] | Bitcoin Futures Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Commodity and Cryptocurrency Futures Contracts	0	$ 0
Commodity and Cryptocurrency Futures Contracts	$ 0