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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 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Activity in Redeemable Capital Shares [Abstract]    
Beginning balance (in Shares)   335,000,000
Beginning balance   $ 9,706,654
Shares issued (in Shares) 31,300,000 85,750,000
Shares issued 602,557 2,096,484
Shares redeemed (in Shares) (27,650,000) (88,250,000)
Shares redeemed (534,455) (2,031,644)
Redemption value adjustment   (3,530,747)
Ending balance (in Shares) 336,150,000 [1] 332,500,000 [1]
Ending balance   $ 6,240,747
[1] No par value, unlimited amount authorized.