Statements of Assets and Liabilities (Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Sep. 30, 2025	Dec. 31, 2024
Cost of short-term investments	$ 950,835,419	$ 927,149,956
Cost of short-term investments held at broker (restricted)	$ 48,337,838	$ 36,223,466
Shares, outstanding (in shares)	43,400,000	44,500,000
Shares, par value (in dollars per share)	$ 0	$ 0