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, 2022	127,790	16,309	(137,044)	(22,806)	268,147	3,184
Net income (loss)	13,696
Other comprehensive income (loss)	10,377
Total comprehensive income (loss)	24,073
Balance at Sep. 30, 2023	152,747	31,332	(126,667)	(23,525)	268,423	3,184
Balance at Mar. 31, 2023	154,291	21,181	(115,465)	(22,806)	268,197	3,184
Net income (loss)	6,126	6,126	0	0	0	0
Other comprehensive income (loss)	(12,898)	0	(12,898)	0	0	0
Total comprehensive income (loss)	(6,772)	6,126	(12,898)	0	0	0
Acquisition of treasury stock	(719)	0	0	(719)	0	0
Stock-based compensation	46	0	0	0	46	0
Balance at Jun. 30, 2023	146,846	27,307	(128,363)	(23,525)	268,243	3,184
Net income (loss)	2,698	2,698	0	0	0	0
Other comprehensive income (loss)	1,696	0	1,696	0	0	0
Total comprehensive income (loss)	4,394	2,698	1,696	0	0	0
Stock-based compensation	180	0	0	0	180	0
Other	1,327	1,327	0	0	0	0
Balance at Sep. 30, 2023	152,747	31,332	(126,667)	(23,525)	268,423	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
Balance at Dec. 31, 2023	172,129	42,150	(118,155)	(23,725)	268,675	3,184
Net income (loss)	11,291
Other comprehensive income (loss)	23,472
Total comprehensive income (loss)	34,763
Balance at Sep. 30, 2024	207,573	53,441	(94,683)	(23,725)	269,356	3,184
Balance at Mar. 31, 2024	195,183	46,692	(99,770)	(23,725)	268,802	3,184
Net income (loss)	3,959	3,959	0	0	0	0
Other comprehensive income (loss)	(8,154)	0	(8,154)	0	0	0
Total comprehensive income (loss)	(4,195)	3,959	(8,154)	0	0	0
Stock-based compensation	481	0	0	0	481	0
Balance at Jun. 30, 2024	191,469	50,651	(107,924)	(23,725)	269,283	3,184
Net income (loss)	2,790	2,790	0	0	0	0
Other comprehensive income (loss)	13,241	0	13,241	0	0	0
Total comprehensive income (loss)	16,031	2,790	13,241	0	0	0
Stock-based compensation	73	0	0	0	73	0
Balance at Sep. 30, 2024	$ 207,573	$ 53,441	$ (94,683)	$ (23,725)	$ 269,356	$ 3,184