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Canadian Dollar Deposits - Additional Information (Detail)	6 Months Ended			12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 CAD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 CAD ($)	Jun. 30, 2021 CAD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)
Cash And Cash Equivalents [Abstract]
Principal deposits	$ 130,131,963	$ 162,086,662	$ 36,147,273	$ 98,523,433
Principal redemptions	75,016,335	93,321,372	$ 32,465,014	59,135,871
Withdrawals during period		$ 420,008		$ 439,240
Deposits, interest bearing	$ 210,122,341				$ 260,194,495	$ 150,588,080	$ 191,849,213
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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Rate of interest on investment.

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Total amount of cash paid for operating activities during the current period.

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The cash outflow for reacquisition of callable preferred stock.

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