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Statements of Financial Condition (Unaudited) (Parentheticals) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Cost of short-term investments $ 1,033,820,142 $ 1,111,804,587
Cost of short-term investments held at brokers (restricted) $ 49,043,183 $ 53,997,606
Shares, par value      
Shares, issued 32,000,000 36,400,000
Shares, outstanding 32,000,000 36,400,000