Statements of Changes in Shareholders' Equity and Redeemable Capital Shares (unaudited) - USD ($)	Total	Retained Earnings [Member]	Redeemable Capital Shares [Member]
Balance at Dec. 31, 2017			$ 271,881,278
Purchases of Shares			283,986,452
Redemption of Shares			(218,903,758)
Net Increase (Decrease) due to Share Transactions			65,082,694
Net Comprehensive Income (Loss)	$ (653,294)	$ (653,294)
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings	653,294	653,294	(653,294)
Adjustment of Redeemable Capital Shares to Redemption Value			6,627,289
Balance at Mar. 31, 2018			342,937,967
Balance at Dec. 31, 2018			316,828,837
Purchases of Shares			43,281,045
Redemption of Shares			(136,069,105)
Net Increase (Decrease) due to Share Transactions			(92,788,060)
Net Comprehensive Income (Loss)	(490,260)	(490,260)
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings	$ 490,260	$ 490,260	(490,260)
Adjustment of Redeemable Capital Shares to Redemption Value			(4,003,482)
Balance at Mar. 31, 2019			$ 219,547,035

Stockholders equity period increase decrease due to share transactions.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The difference between the carrying amount of a financial instrument subject to a registration payment arrangement recorded as temporary equity prior to adoption of FSP EITF 00-19-2 and the carrying amount reclassified to permanent equity upon the adoption of FSP EITF 00-19-2. Recorded as a cumulative effect adjustment to the beginning balance of retained earnings. Does not apply to registration payment arrangements that are no longer outstanding upon adoption of FSP EITF 00-19-2.

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Value of stock issued pursuant to acquisitions during the period.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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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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