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Selected Quarterly Information (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
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
Oct. 31, 2016
Income                      
Interest Income $ 444,064 $ 495,699 $ 424,679 $ 371,216 $ 503,822 $ 547,064 $ 525,897 $ 559,049 $ 1,735,658 $ 2,135,832 $ 2,576,284
Total Income 444,064 495,699 424,679 371,216 503,822 547,064 525,897 559,049 1,735,658 2,135,832 2,576,284
Expenses                      
Sponsor's fee (122,419) (128,476) (125,671) (132,392) (167,184) (169,120) (168,750) (175,456) (508,958) (680,510) (713,817)
Total Expenses (122,419) (128,476) (125,671) (132,392) (167,184) (169,120) (168,750) (175,456) (508,958) (680,510) (713,817)
Net Comprehensive Income $ 321,645 $ 367,223 $ 299,008 $ 238,824 $ 336,638 $ 377,944 $ 357,147 $ 383,593 $ 1,226,700 $ 1,455,322 $ 1,862,467
Basic and Diluted Earnings per Share $ 0.19 [1] $ 0.22 [1] $ 0.18 [1] $ 0.14 [1] $ 0.16 [1] $ 0.17 [1] $ 0.16 [1] $ 0.16 [1] $ 0.73 $ 0.65 $ 0.77
Weighted-average Shares Outstanding 1,679,348 1,706,522 1,661,798 1,688,043 2,095,652 2,205,435 2,269,663 2,343,478 1,684,110 2,228,219 2,409,016
Cash Dividends per Share $ 0.21 [1] $ 0.20 [1] $ 0.17 [1] $ 0.13 [1] $ 0.18 [1] $ 0.17 [1] $ 0.17 [1] $ 0.15 [1] $ 0.72 $ 0.66 $ 0.81
[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.