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Selected Quarterly Information (Details) (USD $)
 3 Months Ended 12 Months Ended
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Income                      
Interest Income   $ 33,329 $ 58,256 $ 314,773 $ 593,154 $ 815,037 $ 477,930 $ 319,717 $ 406,358 $ 2,205,838 $ 699,872
Total Income   33,329 58,256 314,773 593,154 815,037 477,930 319,717 406,358 2,205,838 699,872
Expenses                      
Sponsor's fee (300,984) (263,385) (261,139) (371,167) (338,278) (408,840) (377,632) (405,568) (1,196,675) (1,530,318) (2,259,026)
Total Expenses (300,984) (263,385) (261,139) (371,167) (338,278) (408,840) (377,632) (405,568) (1,196,675) (1,530,318) (2,259,026)
Net (Loss)/Income (300,984) (230,056) (202,883) (56,394) 254,876 406,197 100,298 (85,851) (790,317) 675,520 (1,559,154)
Other Comprehensive (Loss)/Income:                      
Currency translation adjustment (4,943) 4,199 (554) 468 62 955 5,624 (1,924) (830) 4,717 9,254
Total Comprehensive (Loss)/Income $ (305,927) $ (225,857) $ (203,437) $ (55,926) $ 254,938 $ 407,152 $ 105,922 $ (87,775) $ (791,147) $ 680,237 $ (1,549,900)
Basic and Diluted Earnings per Share $ (0.13) $ (0.11) $ (0.10) $ (0.02) $ 0.11 $ 0.14 $ 0.04 $ (0.03) $ (0.34) $ 0.25 $ (0.37)
Weighted-average Shares Outstanding 2,350,543 2,101,630 2,030,556 2,880,435 2,252,174 2,824,457 2,717,978 2,995,109 2,342,486 2,697,260 4,202,329
Cash Dividends per Share       $ 0.04 $ 0.11 $ 0.14   $ 0.01 $ 0.04 $ 0.25