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Statements of Financial Condition (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Redeemable Capital Shares, no par value
Redeemable Capital Shares, shares authorized 41,500,000 41,500,000
Redeemable Capital Shares, shares issued 1,500,000 1,650,000
Redeemable Capital Shares, shares outstanding 1,500,000 1,650,000