Consolidated Statements of Stockholder's Equity Statement - USD ($) $ in Thousands	Total	Retained Earnings (Accumulated Deficit)	Accumulated other comprehensive income [Member]	Treasury Stock, Common [Member]	Common Stock Class A [Member] Common stock [Member]	Common Stock Class B [Member] Common stock [Member]
Balance at Dec. 31, 2021	$ 99,957	$ (9,698)	$ (138,989)	$ (20,101)	$ 265,561	$ 3,184
Net income (loss)	6,449	6,449	0	0	0	0
Other comprehensive income (loss)	17,189	0	17,189	0	0	0
Total comprehensive income (loss)	23,638	6,449	17,189	0	0	0
Common stock issuance	1,788	0	0	0	1,788	0
Stock-based compensation	93	0	0	0	93	0
Balance at Mar. 31, 2022	125,476	(3,249)	(121,800)	(20,101)	267,442	3,184
Balance at Dec. 31, 2021	99,957	(9,698)	(138,989)	(20,101)	265,561	3,184
Net income (loss)	12,348
Other comprehensive income (loss)	(1,504)
Total comprehensive income (loss)	10,844
Balance at Sep. 30, 2022	111,045	2,650	(140,493)	(22,284)	267,988	3,184
Balance at Mar. 31, 2022	125,476	(3,249)	(121,800)	(20,101)	267,442	3,184
Net income (loss)	2,492	2,492	0	0	0	0
Other comprehensive income (loss)	(3,752)	0	(3,752)	0	0	0
Total comprehensive income (loss)	(1,260)	2,492	(3,752)	0	0	0
Common stock issuance	455	0	0	0	455	0
Acquisition of treasury stock	(1,300)	0	0	(1,300)	0	0
Stock-based compensation	(47)	0	0	0	(47)	0
Balance at Jun. 30, 2022	123,324	(757)	(125,552)	(21,401)	267,850	3,184
Net income (loss)	3,407	3,407	0	0	0	0
Other comprehensive income (loss)	(14,941)	0	(14,941)	0	0	0
Total comprehensive income (loss)	(11,534)	3,407	(14,941)	0	0	0
Acquisition of treasury stock	(883)	0	0	(883)	0	0
Stock-based compensation	138	0	0	0	138	0
Balance at Sep. 30, 2022	111,045	2,650	(140,493)	(22,284)	267,988	3,184
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			0	0	0	0
Balance at Sep. 30, 2023	$ 152,747	$ 31,332	$ (126,667)	$ (23,525)	$ 268,423	$ 3,184