Note 1 - Organization (Details Textual) - USD ($)		3 Months Ended				6 Months Ended
Note 1 - Organization (Details Textual) - USD ($)	Jan. 05, 2024	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Shares of Stock Classifed as Temporary Equity Surrendered During Reporting Period (in shares)						79,560,000	1,364,000
Value of Stock Classified as Temporary Equity Surrendered During Reporting Period		$ 1,171,825,263	$ 2,900,294,791	$ 46,353,487	$ 100,000
Stock Issued During Period, Shares, New Issues (in shares)						335,960,000	540,520,000
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

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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