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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

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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