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Note 2 - Summary of Significant Accounting Policies (Details) - Activity in Redeemable Capital Shares (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Activity in Redeemable Capital Shares [Abstract]    
Beginning balance (in Shares) 592,450,000 719,550,000
Beginning balance $ 6,859,750 $ 11,645,298
Shares issued (in Shares) 14,000,000 56,750,000
Shares issued 175,446 847,967
Shares redeemed (in Shares) (18,200,000) (188,050,000)
Shares redeemed (227,490) (2,652,558)
Redemption value adjustment 767,323 (2,265,678)
Ending balance (in Shares) 588,250,000 588,250,000
Ending balance $ 7,575,029 $ 7,575,029