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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
Redeemable Capital Shares, shares authorized 41,500,000 41,500,000 38,500,000
Redeemable Capital Shares, shares issued 1,650,000 1,700,000 1,850,000
Redeemable Capital Shares, shares outstanding 1,650,000 1,700,000 1,850,000