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Selected Quarterly Information (Unaudited) - Summary of Selected Quarterly Information (Unaudited) (Detail) - USD ($)
3 Months Ended 12 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Income                      
Interest Income $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0
Total Income 0 0 0 0 0 0 0 0 0 0 0
Expenses                      
Sponsor's fee (142,521) (146,405) (244,368) (216,290) (128,271) (93,746) (94,659) (103,675) (749,584) (420,351) (503,842)
Interest Expense (36,927) (37,499) (2,478)           (76,904)    
Total Expenses (179,448) (183,904) (246,846) (216,290) (128,271) (93,746) (94,659) (103,675) (826,488) (420,351) (503,842)
Net Loss $ (179,448) $ (183,904) $ (246,846) $ (216,290) $ (128,271) $ (93,746) $ (94,659) $ (103,675) $ (826,488) $ (420,351) $ (503,842)
Basic and Diluted Earnings per Share $ (0.12) $ (0.12) $ (0.09) $ (0.08) $ (0.08) $ (0.08) $ (0.08) $ (0.08) $ (0.38) $ (0.32) $ (0.38)
Weighted-average Shares Outstanding 1,503,261 1,597,283 2,855,000 2,725,000 1,594,565 1,189,674 1,184,270 1,264,130 2,166,393 1,309,178 1,322,603
Cash Dividends per Share $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0
Other Comprehensive (Loss)/Income:                      
Currency translation adjustment $ 4,702 $ (6,344) $ (12,266) $ 314 $ (449) $ 935 $ 67 $ (545) $ (13,594) $ 8 $ 3,828
Total Comprehensive Loss $ (174,746) $ (190,248) $ (259,112) $ (215,976) $ (128,720) $ (92,811) $ (94,592) $ (104,220) $ (840,082) $ (420,343) $ (500,014)