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Statements of Financial Condition (Parenthetical) (Unaudited) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Redeemable Capital Shares, no par value $ 0 $ 0
Redeemable Capital Shares, shares issued 2,350,000 2,700,000
Redeemable Capital Shares, shares outstanding 2,350,000 2,700,000