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Selected Quarterly Information (Details) (USD $)
 3 Months Ended 12 Months Ended
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2010
Jan. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2009
Selected Quarterly Information [Abstract]                      
Interest Income $ 593,154 $ 815,037 $ 477,930 $ 319,717 $ 310,708 $ 150,146 $ 113,344 $ 125,674 $ 2,205,838 $ 699,872 $ 4,855,647
Total Income 593,154 815,037 477,930 319,717 310,708 150,146 113,344 125,674 2,205,838 699,872 4,855,647
Sponsor's fee (338,278) (408,840) (377,632) (405,568) (489,422) (528,334) (623,086) (618,184) (1,530,318) (2,259,026) (2,319,835)
Total Expenses (338,278) (408,840) (377,632) (405,568) (489,422) (528,334) (623,086) (618,184) (1,530,318) (2,259,026) (2,319,835)
Net (Loss)/Income 254,876 406,197 100,298 (85,851) (178,714) (378,188) (509,742) (492,510) 675,520 (1,559,154) 2,535,812
Currency translation adjustment 62 955 5,624 (1,924) (8,160) (14,998) 9,661 22,751 4,717 9,254 (67,545)
Comprehensive Income Net Of Tax $ 254,938 $ 407,152 $ 105,922 $ (87,775) $ (186,874) $ (393,186) $ (500,081) $ (469,759) $ 680,237 $ (1,549,900) $ 2,468,267
Basic and Diluted Earnings per Share $ 0.11 $ 0.14 $ 0.04 $ (0.03) $ (0.05) $ (0.09) $ (0.11) $ (0.12) $ 0.25 $ (0.37) $ 0.59
Weighted-average Shares Outstanding 2,252,174 2,824,457 2,717,978 2,995,109 3,718,478 4,171,739 4,708,427 4,227,174 2,697,260 4,202,329 4,265,753
Cash Dividends per Share $ 0.11 $ 0.14   $ 0.01         $ 0.25   $ 1.11