Equity Securities at Fair Value - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Equity securities, at fair value	$ 3,384,000	$ 2,710,000
Change in fair value of equity securities	(401,000)	(1,792,000)	$ 767,000
Proceeds from sales of equity securities	$ 0	1,390,000	$ 0
Gross realized gain in equity securities		383,000
Gross realized losses in equity securities		$ 0