Statements of Changes in Shareholders' Equity and Redeemable Capital Shares (Unaudited) - USD ($)	Total	Redeemable Capital Shares [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2017		$ 169,271,222
Purchase of Shares	$ 15,598,271	15,598,271
Redemption of Shares		(11,698,732)
Net Increase (Decrease) due to Share Transactions		3,899,539
Distributions	(60,690)		$ (60,690)
Net Comprehensive Income (Loss)	94,103		94,103
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings	(33,413)	33,413	(33,413)
Adjustment of Redeemable Capital Shares to Redemption Value		(4,840,266)
Balance at Mar. 31, 2018		168,363,908
Balance at Dec. 31, 2018		162,583,352
Purchase of Shares	18,501,243	18,501,243
Redemption of Shares		(55,749,121)
Net Increase (Decrease) due to Share Transactions		(37,247,878)
Distributions	(257,009)		(257,009)
Net Comprehensive Income (Loss)	279,876		279,876
Adjustment of Redeemable Capital Shares to Redemption Value related to Retained Earnings	$ (22,867)	22,867	$ (22,867)
Adjustment of Redeemable Capital Shares to Redemption Value		3,942,019
Balance at Mar. 31, 2019		$ 129,300,360

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Temporary equity, stock redeemed or called during period value.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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

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