Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Capital	Retained Earnings	Accumulated  Other Comprehensive Income	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2023		5,173,000
Beginning balance at Dec. 31, 2023	$ 237,657	$ 5,173	$ 34,315	$ 182,336	$ 16,201	$ (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,109			16,109
Dividends paid ($4.50 per common share)	(23,088)			(23,088)
Change in fair value of interest rate derivatives	(540)				(540)
Ending balance (in shares) at Mar. 31, 2024		5,173,000
Ending balance at Mar. 31, 2024	$ 230,138	$ 5,173	34,315	175,357	15,661	(368)
Beginning balance (in shares) at Dec. 31, 2024	5,173,450	5,173,000
Beginning balance at Dec. 31, 2024	$ 176,859	$ 5,173	34,765	133,402	3,887	(368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,312			12,312
Dividends paid ($4.50 per common share)	(23,101)			(23,101)
Change in fair value of interest rate derivatives	$ (2,981)				(2,981)
Ending balance (in shares) at Mar. 31, 2025	5,173,450	5,173,000
Ending balance at Mar. 31, 2025	$ 163,089	$ 5,173	$ 34,765	$ 122,613	$ 906	$ (368)