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Statements of Financial Condition (Parenthetical) - $ / shares
Jun. 30, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Redeemable Capital Shares, no par value
Redeemable Capital Shares, shares authorized 44,500,000 44,500,000
Redeemable Capital Shares, shares issued 1,800,000 2,050,000
Redeemable Capital Shares, shares outstanding 1,800,000 2,050,000