v3.26.1
Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value - Bitcoin and Carbon Credit Futures ETF (Details) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Cash Equivalents $ 501,499,085 $ 174,300,148
Bitcoin 1,071,328  
Commodity and Cryptocurrency Futures Contracts 402,086  
Total 502,972,499 174,350,403
European Carbon Allowances Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 11,033  
7RCC Spot Bitcoin and Carbon Credit Futures ETF [Member]    
Cash Equivalents 267,927  
Bitcoin 1,071,328 0
Total 1,350,288  
7RCC Spot Bitcoin and Carbon Credit Futures ETF [Member] | European Carbon Allowances Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 11,033  
Fair Value, Inputs, Level 1 [Member]    
Cash Equivalents 501,499,085 174,300,148
Bitcoin 1,071,328  
Total 502,972,499 174,350,403
Fair Value, Inputs, Level 1 [Member] | European Carbon Allowances Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 11,033  
Fair Value, Inputs, Level 1 [Member] | 7RCC Spot Bitcoin and Carbon Credit Futures ETF [Member]    
Cash Equivalents 267,927  
Bitcoin 1,071,328  
Total 1,350,288  
Fair Value, Inputs, Level 1 [Member] | 7RCC Spot Bitcoin and Carbon Credit Futures ETF [Member] | European Carbon Allowances Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 11,033  
Fair Value, Inputs, Level 2 [Member]    
Cash Equivalents 0 0
Bitcoin 0  
Total 0 0
Fair Value, Inputs, Level 2 [Member] | European Carbon Allowances Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 0  
Fair Value, Inputs, Level 2 [Member] | 7RCC Spot Bitcoin and Carbon Credit Futures ETF [Member]    
Cash Equivalents 0  
Bitcoin 0  
Total 0  
Fair Value, Inputs, Level 2 [Member] | 7RCC Spot Bitcoin and Carbon Credit Futures ETF [Member] | European Carbon Allowances Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 0  
Fair Value, Inputs, Level 3 [Member]    
Cash Equivalents 0 0
Bitcoin 0  
Total 0 $ 0
Fair Value, Inputs, Level 3 [Member] | European Carbon Allowances Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts 0  
Fair Value, Inputs, Level 3 [Member] | 7RCC Spot Bitcoin and Carbon Credit Futures ETF [Member]    
Cash Equivalents 0  
Bitcoin 0  
Total 0  
Fair Value, Inputs, Level 3 [Member] | 7RCC Spot Bitcoin and Carbon Credit Futures ETF [Member] | European Carbon Allowances Futures Contracts [Member]    
Commodity and Cryptocurrency Futures Contracts $ 0