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Note 2 - Significant Accounting Policies (Details) - Activity in Redeemable Capital Shares - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Activity in Redeemable Capital Shares [Abstract]      
Beginning balance (in Shares) 344,000,000 [1] 332,500,000 335,000,000
Beginning balance   $ 6,240,747 $ 9,706,654
Shares issued (in Shares) 57,150,000 74,950,000 85,750,000
Shares issued $ 859,468 $ 1,361,917 $ 2,096,484
Shares redeemed (in Shares) (67,600,000) (63,450,000) (88,250,000)
Shares redeemed $ (1,029,094) $ (1,108,223) $ (2,031,644)
Redemption value adjustment     $ (3,530,747)
Ending balance (in Shares) 333,550,000 [1] 344,000,000 [1] 332,500,000
Ending balance     $ 6,240,747
[1] No par value, unlimited amount authorized.