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Statements of Assets and Liabilities (Unaudited) (Parentheticals) - USD ($)
$ / shares in Thousands
Jun. 30, 2025
Dec. 31, 2024
Cost of short-term investments $ 920,683,294 $ 927,149,956
Cost of short-term investments held at broker (restricted) $ 43,045,459 $ 36,223,466
Shares, outstanding (in shares) 43,500,000 44,500,000
Shares, par value (in dollars per share) $ 0 $ 0