Consolidated Statements of Stockholder's Equity Statement - USD ($) $ in Thousands	Total	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Common Stock Class A [Member] Common Stock	Common Stock Class B [Member] Common Stock
Balance at Dec. 31, 2022	$ 127,790	$ 16,309	$ (137,044)	$ (22,806)	$ 268,147	$ 3,184
Net income (loss)	4,872	4,872	0	0	0	0
Other comprehensive income (loss)	21,579	0	21,579	0	0	0
Total comprehensive income (loss)	26,451	4,872	21,579	0	0	0
Stock-based compensation	50	0	0	0	50	0
Balance at Mar. 31, 2023	154,291	21,181	(115,465)	(22,806)	268,197	3,184
Balance at Dec. 31, 2023	172,129	42,150	(118,155)	(23,725)	268,675	3,184
Net income (loss)	4,542	4,542	0	0	0	0
Other comprehensive income (loss)	18,385	0	18,385	0	0	0
Total comprehensive income (loss)	22,927	4,542	18,385	0	0	0
Stock-based compensation	127	0	0	0	127	0
Balance at Mar. 31, 2024	$ 195,183	$ 46,692	$ (99,770)	$ (23,725)	$ 268,802	$ 3,184