CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Shares	Paid-in Capital	Accumulated Distributions in Excess of Earnings	Total Beneficial Interest	Noncontrolling Interest in Operating Partnership	Noncontrolling Interest in Partially Owned Properties	Accumulated Other Comprehensive Income (Loss)	Total
Beginning Balance at Dec. 31, 2020		$ 139,105	$ (29,739)	$ 109,366	$ 181,621	$ 2,346	$ (1,805)	$ 291,528
Beginning Balance (in shares) at Dec. 31, 2020	9,855
Shares/units redeemed		(777)		(777)	(628)			(1,405)
Shares/units redeemed (in shares)	(41)
Dividends and distributions declared			(2,642)	(2,642)	(4,835)			(7,477)
Dividends reinvested - stock dividend		1,686		1,686				1,686
Dividends reinvested - stock dividend (in shares)	89
Issuance of shares under optional purchase plan		1,307		1,307				1,307
Issuance of shares under optional purchase plan (in shares)	65
Change in fair value of interest rate swaps							2,384	2,384
Net income (loss)			2,052	2,052	3,753	31		5,836
Ending balance at Mar. 31, 2021		141,321	(30,329)	110,992	179,911	2,377	579	293,859
Ending balance (in shares) at Mar. 31, 2021	9,968
Beginning Balance at Dec. 31, 2020		139,105	(29,739)	109,366	181,621	2,346	(1,805)	291,528
Beginning Balance (in shares) at Dec. 31, 2020	9,855
Change in fair value of interest rate swaps								1,473
Net income (loss)								19,832
Ending balance at Sep. 30, 2021		146,109	(30,641)	115,468	179,582	2,198	(332)	296,916
Ending balance (in shares) at Sep. 30, 2021	10,215
Beginning Balance at Mar. 31, 2021		141,321	(30,329)	110,992	179,911	2,377	579	293,859
Beginning Balance (in shares) at Mar. 31, 2021	9,968
Contribution of assets in exchange for the issuance of noncontrolling interest shares					890			890
Shares/units redeemed		(292)		(292)	(1,853)			(2,145)
Shares/units redeemed (in shares)	(15)
Dividends and distributions declared			(2,672)	(2,672)	(4,821)			(7,493)
Dividends reinvested - stock dividend		1,679		1,679				1,679
Dividends reinvested - stock dividend (in shares)	88
Issuance of shares under optional purchase plan		820		820				820
Issuance of shares under optional purchase plan (in shares)	41
Change in fair value of interest rate swaps							(845)	(845)
Net income (loss)			2,963	2,963	5,355	(40)		8,278
Ending balance at Jun. 30, 2021		143,528	(30,038)	113,490	179,482	2,337	(266)	295,043
Ending balance (in shares) at Jun. 30, 2021	10,082
Contribution of assets in exchange for the issuance of noncontrolling interest shares					1,993			1,993
Shares issued under trustee compensation plan		57		57				57
Shares issued under trustee compensation plan (in shares)	3
Shares/units redeemed		(105)		(105)	(810)			(915)
Shares/units redeemed (in shares)	(6)
Dividends and distributions declared			(2,707)	(2,707)	(4,836)			(7,543)
Dividends reinvested - stock dividend		1,743		1,743				1,743
Dividends reinvested - stock dividend (in shares)	92
Issuance of shares under optional purchase plan		886		886				886
Issuance of shares under optional purchase plan (in shares)	44
Change in fair value of interest rate swaps							(66)	(66)
Net income (loss)			2,104	2,104	3,753	(139)		5,718
Ending balance at Sep. 30, 2021		146,109	(30,641)	115,468	179,582	2,198	(332)	296,916
Ending balance (in shares) at Sep. 30, 2021	10,215
Beginning Balance at Dec. 31, 2021		148,562	(31,706)	116,856	176,954	2,657	(950)	295,517
Beginning Balance (in shares) at Dec. 31, 2021	10,342,000
Contribution of assets in exchange for the issuance of noncontrolling interest shares					10,180			10,180
Shares/units redeemed		(401)		(401)	(335)			(736)
Shares/units redeemed (in shares)	(18,000)
Dividends and distributions declared			(3,007)	(3,007)	(5,359)			(8,366)
Dividends reinvested - stock dividend		1,716		1,716				1,716
Dividends reinvested - stock dividend (in shares)	79,000
Issuance of shares under optional purchase plan		1,313		1,313				1,313
Issuance of shares under optional purchase plan (in shares)	57,000
Change in fair value of interest rate swaps							6,524	6,524
Net income (loss)			1,214	1,214	2,145	30		3,389
Ending balance at Mar. 31, 2022		151,190	(33,499)	117,691	183,585	2,687	5,574	309,537
Ending balance (in shares) at Mar. 31, 2022	10,460,000
Beginning Balance at Dec. 31, 2021		148,562	(31,706)	116,856	176,954	2,657	(950)	295,517
Beginning Balance (in shares) at Dec. 31, 2021	10,342,000
Change in fair value of interest rate swaps								15,306
Net income (loss)								20,812
Ending balance at Sep. 30, 2022		156,091	(33,270)	122,821	185,758	2,642	14,356	325,577
Ending balance (in shares) at Sep. 30, 2022	10,680,000
Beginning Balance at Mar. 31, 2022		151,190	(33,499)	117,691	183,585	2,687	5,574	309,537
Beginning Balance (in shares) at Mar. 31, 2022	10,460,000
Shares/units redeemed		(386)		(386)	(138)			(524)
Shares/units redeemed (in shares)	(18,000)
Dividends and distributions declared			(3,037)	(3,037)	(5,357)			(8,394)
Dividends reinvested - stock dividend		1,877		1,877				1,877
Dividends reinvested - stock dividend (in shares)	86,000
Issuance of shares under optional purchase plan		806		806				806
Issuance of shares under optional purchase plan (in shares)	35,000
Change in fair value of interest rate swaps							3,815	3,815
Net income (loss)			2,568	2,568	4,531	8		7,107
Ending balance at Jun. 30, 2022		153,487	(33,968)	119,519	182,621	2,695	9,389	314,224
Ending balance (in shares) at Jun. 30, 2022	10,563,000
Contribution of assets in exchange for the issuance of noncontrolling interest shares					2,210			2,210
Shares issued under trustee compensation plan		65		65				65
Shares issued under trustee compensation plan (in shares)	3,000
Shares/units redeemed		(310)		(310)	(293)			(603)
Shares/units redeemed (in shares)	(14,000)
Dividends and distributions declared			(3,070)	(3,070)	(5,381)			(8,451)
Dividends reinvested - stock dividend		1,910		1,910				1,910
Dividends reinvested - stock dividend (in shares)	87,000
Issuance of shares under optional purchase plan		939		939				939
Issuance of shares under optional purchase plan (in shares)	41,000
Change in fair value of interest rate swaps							4,967	4,967
Net income (loss)			3,768	3,768	6,601	(53)		10,316
Ending balance at Sep. 30, 2022		$ 156,091	$ (33,270)	$ 122,821	$ 185,758	$ 2,642	$ 14,356	$ 325,577
Ending balance (in shares) at Sep. 30, 2022	10,680,000