UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance, beginning of period, Shares at Dec. 31, 2021	21,144
Balance, beginning of period at Dec. 31, 2021	$ 55,298	$ 116,531	$ (1,622)
Pension benefit obligation
Common stock issued upon exercise of options and warrants, Shares	2,895
Repurchase of common stock, Shares	(2,832)
Common stock issued upon exercise of options and warrants	$ 14,416
Repurchase of common stock	(34,285)
Stock-based compensation	$ 1,518
Net income		46,435		46,435
Balance, end of period, Shares at Jun. 30, 2022	21,207
Balance, end of period at Jun. 30, 2022	$ 36,947	162,966	(1,622)	198,291
Balance, beginning of period, Shares at Mar. 31, 2022	21,292
Balance, beginning of period at Mar. 31, 2022	$ 47,844	137,646	(1,622)
Pension benefit obligation
Common stock issued upon exercise of options and warrants, Shares	1,529
Repurchase of common stock, Shares	(1,614)
Common stock issued upon exercise of options and warrants	$ 8,556
Repurchase of common stock	(20,181)
Stock-based compensation	$ 728
Net income		25,320		25,320
Balance, end of period, Shares at Jun. 30, 2022	21,207
Balance, end of period at Jun. 30, 2022	$ 36,947	162,966	(1,622)	198,291
Balance, beginning of period, Shares at Dec. 31, 2022	20,131
Balance, beginning of period at Dec. 31, 2022	$ 28,906	202,514	(3,031)	228,389
Pension benefit obligation
Common stock issued upon exercise of options and warrants, Shares	2,805
Repurchase of common stock, Shares	(1,784)
Common stock issued upon exercise of options and warrants	$ 15,678
Repurchase of common stock	(18,464)
Stock-based compensation	$ 1,817
Net income		27,777		27,777
Balance, end of period, Shares at Jun. 30, 2023	21,152
Balance, end of period at Jun. 30, 2023	$ 27,937	230,291	(3,031)	255,197
Balance, beginning of period, Shares at Mar. 31, 2023	20,496
Balance, beginning of period at Mar. 31, 2023	$ 29,485	216,337	(3,031)
Pension benefit obligation
Common stock issued upon exercise of options and warrants, Shares	1,718
Repurchase of common stock, Shares	(1,062)
Common stock issued upon exercise of options and warrants	$ 8,718
Repurchase of common stock	(11,171)
Stock-based compensation	$ 905
Net income		13,954		13,954
Balance, end of period, Shares at Jun. 30, 2023	21,152
Balance, end of period at Jun. 30, 2023	$ 27,937	$ 230,291	$ (3,031)	$ 255,197