Income Taxes - Effective Income Tax (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Pre-tax income attributable to taxable entities	$ 4,646,000	$ 10,045,000	$ 22,077,000
Federal tax expense at statutory tax rate (21%)	976,000	2,109,000	4,636,000
State and local taxes, net of federal income tax expense	(13,000)	0	81,000
Permanent adjustments	(15,000)	(155,000)	0
Adjustments for foreclosure property	0	(464,000)	479,000
Foreign income tax differential	33,000	12,000	(4,000)
Return to provision	128,000	2,313,000	(1,000)
Valuation allowance, net	5,737,000	(4,717,000)	1,365,000
Adjustments to investment in partnership basis differences	(6,427,000)	0	0
Adjustments to federal tax attributes for disposed investments	740,000	0	0
Other	(97,000)	3,342,000	(280,000)
Income tax expense	1,062,000	2,440,000	6,276,000
Income tax penalties and interest expense	$ 0	$ 0	$ 0