Investments in Real Estate-Related Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Principal Balance	$ 16,174	$ 12,296
Unamortized Premium (Discount)	126	143
Amortized Cost / Cost	23,985	12,850
Unrealized Gain (Loss), Net	(325)	(165)
Fair Value	23,660	12,685
Non-agency CMBS
Debt Instrument [Line Items]
Principal Balance	10,946	7,171
Unamortized Premium (Discount)	(87)	(83)
Amortized Cost / Cost	10,859	7,088
Unrealized Gain (Loss), Net	(559)	(154)
Fair Value	$ 10,300	$ 6,934
Period-end Weighted Average Yield	4.22%	3.60%
Corporate debt
Debt Instrument [Line Items]
Principal Balance	$ 5,228	$ 5,125
Unamortized Premium (Discount)	213	226
Amortized Cost / Cost	5,441	5,351
Unrealized Gain (Loss), Net	(196)	(7)
Fair Value	$ 5,245	$ 5,344
Period-end Weighted Average Yield	3.70%	3.58%
Preferred stock of REITs
Debt Instrument [Line Items]
Amortized Cost / Cost	$ 3,651	$ 411
Unrealized Gain (Loss), Net	(10)	(4)
Fair Value	$ 3,641	$ 407
Period-end Weighted Average Yield	6.26%	6.80%
Common stock of REITs
Debt Instrument [Line Items]
Amortized Cost / Cost	$ 4,034	$ 0
Unrealized Gain (Loss), Net	440	0
Fair Value	$ 4,474	$ 0
Period-end Weighted Average Yield	3.23%	0.00%