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
	Mar. 31, 2014		Dec. 31, 2013
Activity in Redeemable Capital Shares [Abstract]
Beginning balance (in Shares)	538,000,000	[1]	719,550,000
Beginning balance	$ 6,271,029		$ 11,645,298
Shares issued (in Shares)	16,000,000		63,250,000
Shares issued	202,435		928,370
Shares redeemed (in Shares)	(6,300,000)		(244,800,000)
Shares redeemed	(77,329)		(3,341,845)
Redemption value adjustment			(2,960,794)
Ending balance (in Shares)	547,700,000	[1]	538,000,000	[1]
Ending balance			$ 6,271,029

[1] No par value, unlimited amount authorized.