Organization - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Organization [Line Items]
Proceeds from private placement issue	$ 10,000,000
Stock issued during period new shares issued in private placement	2,549,002
Stock issued during period value, reinvestment of dividends	$ 1,209,200	$ 1,319,241	$ 1,864,760
Next Point Advisors L.P [Member]
Organization [Line Items]
Equity method investments ownership percentage	26.30%
Stock issued during period value, reinvestment of dividends	$ 14,200,000