Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Capital in excess of par value	Cumulative net income	Cumulative net income	Cumulative dividends	Accumulated other comprehensive income/(loss)
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
Balance at Dec. 31, 2024	179,541	$ 138	271,092	845,295		(943,396)	6,412
Balance, Shares at Dec. 31, 2024		13,851
Shares of Beneficial Interest:
Issued	35		35
Restricted stock-based compensation expense	213		213
Dividends	(10,180)					(10,180)
Comprehensive income:
Net income	4,777			4,777
Unrealized net gain/(loss) on cash flow hedges	(2,220)						(2,220)
Subtotal - comprehensive income	2,557				$ 4,777		(2,220)
Balance at Mar. 31, 2025	$ 172,166	$ 138	$ 271,340	$ 850,072		$ (953,576)	$ 4,192
Balance, Shares at Mar. 31, 2025		13,851