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Selected Quarterly Information (Unaudited) - Schedule of Selected Quarterly Information (Detail) - USD ($)

2 Months Ended

3 Months Ended

12 Months Ended

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

Income

Interest Income

$ 280,820

$ 125,346

$ 399,666

$ 339,643

$ 257,267

$ 220,319

$ 202,400

$ 45,511

$ 30,392

$ 16,404

$ 1,216,895

$ 294,707

Total Income

280,820

125,346

399,666

339,643

257,267

220,319

202,400

45,511

30,392

16,404

1,216,895

294,707

Expenses

Sponsor's fee

(102,760)

(115,516)

(160,266)

(162,663)

(165,617)

(175,416)

(189,135)

(187,853)

(178,789)

(200,899)

(663,962)

(756,676)

Total Expenses

(102,760)

(115,516)

(160,266)

(162,663)

(165,617)

(175,416)

(189,135)

(187,853)

(178,789)

(200,899)

(663,962)

(756,676)

Net Comprehensive Income/(Loss)

$ 178,060

$ 9,830

$ 239,400

$ 176,980

$ 91,650

$ 44,903

$ 13,265

$ (142,342)

$ (148,397)

$ (184,495)

$ 552,933

$ (461,969)

Basic and Diluted Earnings per Share

$ 0.09

^[1]

$ 0.00

^[2]

$ 0.11

^[1]

$ 0.08

^[1]

$ 0.04

^[1]

$ 0.02

^[1]

$ 0.01

^[1]

$ (0.06)

^[1]

$ (0.06)

^[1]

$ (0.07)

^[1]

$ 0.26

$ (0.18)

Weighted-average Shares Outstanding

2,081,148

2,230,328

2,096,739

2,136,413

2,186,517

2,230,435

2,375,000

2,492,391

2,473,034

2,686,413

2,162,329

2,506,986

Cash Dividends per Share

$ 0.09

^[1]

$ 0.10

^[1]

$ 0.07

^[1]

$ 0.04

^[1]

$ 0.01

^[1]

$ 0.01

^[1]

$ 0.00

^[1]

$ 0.00

^[1]

$ 0.00

^[1]

$ 0.22

$ 0.01

[1]	The amount shown for a Share outstanding for quarterly statements may not correlate with year to date amounts due to timing of subscriptions and redemptions in relation to income earned or distributed.
[2]	Less than $0.01 per Share

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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