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Note 1 - Organization (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 05, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2024
Shares of Stock Classifed as Temporary Equity Surrendered During Reporting Period (in shares)         2,444,000
Value of Stock Classified as Temporary Equity Surrendered During Reporting Period   $ 35,985,368 $ 46,353,487 $ 100,000  
Stock Issued During Period, Shares, New Issues (in shares)         646,440,000
Sponsors Fee Annualized Accrual Rate Based on Daily Net Asset Value 0.25%       0.25%
BlackRock Financial Management, Inc. [Member]          
Shares of Stock Classifed as Temporary Equity Surrendered During Reporting Period (in shares) 4,000        
Value of Stock Classified as Temporary Equity Surrendered During Reporting Period $ 100,000        
Shares Redeemed, Price Per Share (in dollars per share) $ 25        
Stock Issued During Period, Shares, New Issues (in shares) 400,000        
Shares Issued, Price Per Share (in dollars per share) $ 25        
Stock Issued During Period, Value, New Issues $ 10,000,000