Swiss Franc Deposits - Additional Information (Detail)	6 Months Ended			12 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2024 CHF (SFr)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 CHF (SFr)	Jun. 30, 2024 CHF (SFr)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CHF (SFr)
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 29,587,224	SFr 26,689,722	$ 14,831,931	SFr 53,411,003
Principal redemptions	69,507,875	62,277,106	$ 68,601,583	93,523,109
Withdrawals (to pay expenses)		SFr 33,474		SFr 530,125
Deposits, interest bearing	$ 138,587,731				SFr 124,534,935	$ 190,287,878	SFr 160,155,792
Annual nominal rate	0.25%				0.25%