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Statements of Financial Condition (Parenthetical) - $ / shares
Dec. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Statement of Financial Position [Abstract]      
Redeemable Capital Shares, no par value $ 0 $ 0 $ 0
Redeemable Capital Shares, shares authorized 28,500,000 28,500,000 26,500,000
Redeemable Capital Shares, shares issued 2,250,000 2,100,000 2,300,000
Redeemable Capital Shares, shares outstanding 2,250,000 2,100,000 2,300,000