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Statements of Financial Condition (Parenthetical) (Unaudited) - $ / shares
Mar. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Redeemable Capital Shares,no par value
Redeemable Capital Shares, shares authorized 29,500,000 29,500,000
Redeemable Capital Shares, shares issued 1,450,000 1,400,000
Redeemable Capital Shares, shares outstanding 1,450,000 1,400,000