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Note 2 - Significant Accounting Policies - Share Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Shares issued (in shares)	175,900,000	275,950,000	398,700,000
Shares issued	$ 3,608,993,778	$ 6,742,609,430	$ 7,299,222,832
Shares redeemed (in shares)	(243,150,000)	(303,100,000)	(185,850,000)
Distributions for Shares redeemed	$ (4,680,125,800)	$ (7,174,837,696)	$ (4,002,727,459)
Net increase (decrease) in Shares issued and outstanding (in shares)	(67,250,000)	(27,150,000)	212,850,000
Net increase (decrease) in net assets from capital share transactions	$ (1,071,132,022)	$ (432,228,266)	$ 3,296,495,373

X

- Definition

Number of stock classified as temporary equity surrendered during the reporting period.

+ References

No definition available.

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X

- Definition

Value of stock classified as temporary equity surrendered during the reporting period.

+ References

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X

- Definition

Number of new stock issued during the period.

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The increase (decrease) during the period in the number of shares issued.

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Change in the value of each type or class of stock classified as temporary equity during the period. The redemption requirement does not constitute an unconditional obligation that will be settled in a variable number of shares constituting a monetary value predominantly indexed to (a) a fixed monetary amount known at inception, (b) an amount inversely correlated with the residual value of the entity, or (c) an amount determined by reference to something other than the fair value of issuer's stock. Does not include mandatorily redeemable stock. The exception is if redemption is required upon liquidation or termination of the reporting entity.

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Value of new stock classified as temporary equity issued during the period.

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