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Comparative Data for the Two Months Ended December 31, 2017 (Unaudited) - Comparative Data for Statements of Changes in Shareholders' Equity (Detail) - USD ($)	1 Months Ended	2 Months Ended		3 Months Ended								12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net Comprehensive Income		$ 173,016	$ 132,613	$ 321,645	$ 367,223	$ 299,008	$ 238,824	$ 336,638	$ 377,944	$ 357,147	$ 383,593	$ 1,226,700	$ 1,455,322
Distributions Paid	$ (93,308)	(189,938)										(1,210,590)	(1,460,231)
Retained Earnings [Member]
Condensed Financial Statements, Captions [Line Items]
Retained Earnings, Beginning of Period/Year		0	0				$ 0				$ 0	0	0
Net Comprehensive Income		173,016	132,613									1,226,700	1,455,322
Distributions Paid		(189,938)	(165,335)									(1,210,590)	(1,460,231)
Adjustment of redeemable capital Shares to redemption value		16,922	32,722									(16,110)	4,909
Retained Earnings, End of Period/Year	$ 0	$ 0	$ 0	$ 0				$ 0				$ 0	$ 0

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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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