Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	At-the-market Offering [Member] Preferred Stock [Member] Series A Preferred Stock [Member]	At-the-market Offering [Member] Common Stock Outstanding [Member]	At-the-market Offering [Member] Additional Paid-in Capital [Member]	At-the-market Offering [Member] Retained Earnings [Member]	At-the-market Offering [Member] Treasury Stock, Common [Member]	At-the-market Offering [Member] Treasury Stock, Preferred [Member]	At-the-market Offering [Member] Noncontrolling Interest [Member] Variable Interest Entity, Primary Beneficiary [Member]	At-the-market Offering [Member] Noncontrolling Interest [Member] Subsidiaries [Member]	At-the-market Offering [Member] Series A Preferred Stock [Member]	At-the-market Offering [Member]	Preferred Stock [Member] Series A Preferred Stock [Member]	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Treasury Stock, Preferred [Member]	Noncontrolling Interest [Member] Variable Interest Entity, Primary Beneficiary [Member]	Noncontrolling Interest [Member] Subsidiaries [Member]	Total
Balances (in shares) at Dec. 31, 2020											1,645,000	5,022,578
Balances at Dec. 31, 2020											$ 16	$ 50	$ 138,043	$ 3,485	$ (4,784)	$ (8,567)			$ 128,243
Net income attributable to preferred stockholders											0	0	0	874	0	0			874
Net income attributable to common stockholders											0	0	0	8,367	0	0			8,367
Preferred stock dividends declared														(874)					(874)
Common stock dividends declared														(2,634)					(2,634)
Vesting of stock-based compensation											0	0	391	0	0	0			391
Cancellation of common stock held in treasury											$ 0	$ 0	(589)	0	589	0			0
Balances (in shares) at Mar. 31, 2021											1,645,000	5,022,578
Balances at Mar. 31, 2021											$ 16	$ 50	137,845	9,218	(4,195)	(8,567)			134,367
Balances (in shares) at Dec. 31, 2021											1,645,000	9,163,934
Balances at Dec. 31, 2021											$ 16	$ 92	222,300	28,367	(4,195)	(8,567)	$ 7,175	$ 95	245,283
Vesting of stock-based compensation (in shares)											0	60,309
Vesting of stock-based compensation											$ 0	$ 1	532	0	0	0	0	0	533
Issuance of common stock through at-the-market offering, net (in shares)	0	91,428							0	532,694
Issuance of common stock through at-the-market offering, net	$ 0	$ 1	$ 1,811	$ 0	$ 0	$ 0	$ 0	$ 0		$ 1,812
Conversion of redeemable noncontrolling interests in the OP (in shares)											0	5,169,603
Conversion of redeemable noncontrolling interests in the OP											$ 0	$ 51	113,484	0	0	0	0	0	113,535
Noncontrolling interest in CMBS VIEs											0	0	0	0	0	0	(7,175)	0	(7,175)
Net income attributable to preferred stockholders											0			874					874
Net income attributable to common stockholders											0	0	0	12,920	0	0	0	0	12,920
Preferred stock dividends declared											0	0	0	(874)	0	0	0	0	(874)
Common stock dividends declared											$ 0	$ 0	0	(7,521)	0	0	0	0	(7,521)
Balances (in shares) at Mar. 31, 2022											1,645,000	14,485,274
Balances at Mar. 31, 2022											$ 16	$ 145	$ 338,127	$ 33,766	$ (4,195)	$ (8,567)	$ 0	$ 95	$ 359,387