Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common stock	Capital in excess of par value	Cumulative net income	Cumulative dividends	Accumulated other comprehensive income/(loss)
Balance at Dec. 31, 2022	$ 229,101	$ 138	$ 269,472	$ 810,661	$ (863,181)	$ 12,011
Balance, Shares at Dec. 31, 2022		13,803
Shares of Beneficial Interest:
Issued	38		38
Issued (in shares)		1
Restricted stock-based compensation expense	188		188
Dividends	(9,869)				(9,869)
Comprehensive income:
Net income	4,459			4,459
Unrealized net gain/(loss) on cash flow hedges	(1,747)					(1,747)
Subtotal - comprehensive income	2,712			4,459		(1,747)
Balance at Mar. 31, 2023	222,170	$ 138	269,698	815,120	(873,050)	10,264
Balance, Shares at Mar. 31, 2023		13,804
Balance at Dec. 31, 2023	200,934	$ 138	270,398	826,061	(902,975)	7,312
Balance, Shares at Dec. 31, 2023		13,824
Shares of Beneficial Interest:
Issued	(146)		(146)
Issued (in shares)		1
Restricted stock-based compensation expense	202		202
Dividends	(10,023)				(10,023)
Comprehensive income:
Net income	5,300			5,300
Unrealized net gain/(loss) on cash flow hedges	191					191
Subtotal - comprehensive income	5,491			5,300		191
Balance at Mar. 31, 2024	$ 196,458	$ 138	$ 270,454	$ 831,361	$ (912,998)	$ 7,503
Balance, Shares at Mar. 31, 2024		13,825