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Comparative Data for the Two Months Ended December 31, 2017 (Unaudited) - Comparative Data for Statements of Changes in Shareholders' Equity (Detail) - USD ($)
2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Condensed Financial Statements, Captions [Line Items]                        
Net Comprehensive Loss $ (122,840) $ (91,379) $ (161,150) $ (204,814) $ (197,879) $ (140,590) $ (145,076) $ (152,159) $ (143,771) $ (151,186) $ (704,433) $ (592,192)
Retained Earnings [Member]                        
Condensed Financial Statements, Captions [Line Items]                        
Beginning of Year 0 0       $ 0       $ 0 0 0
Net Comprehensive Loss (122,840) (91,379)                 (704,433) (592,192)
Adjustment of redeemable capital Shares to redemption value 122,840 91,379                 704,433 592,192
End of Year $ 0 $ 0 $ 0       $ 0       $ 0 $ 0