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Canadian Dollar Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 CAD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Sep. 30, 2020 CAD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)
Cash And Cash Equivalents [Abstract]
Principal deposits	$ 61,910,301	$ 73,928,413	$ 66,302,059	$ 83,848,876
Principal redemptions	32,465,014	44,375,921	$ 103,973,357	$ 152,900,891
Withdrawals during period		$ 258,721
Deposits, interest bearing	$ 136,398,774				$ 182,194,662	$ 117,914,262	$ 152,900,891
Annual nominal rate	(0.00%)				(0.00%)

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

Rate of interest on investment.

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The cash outflow for reacquisition of callable preferred stock.

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The cash inflow from issuance of preferred stock that is classified as callable.

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The cash outflow for a segregated fund account during the period.

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