XML 25 R3.htm IDEA: XBRL DOCUMENT v3.19.3
Statements of Financial Condition (Parenthetical) - $ / shares
Sep. 30, 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 1,450,000 1,650,000
Redeemable Capital Shares, shares outstanding 1,450,000 1,650,000