UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance, beginning of period, Shares at Dec. 31, 2020	22,737
Balance, beginning of period at Dec. 31, 2020	$ 72,926	$ 69,007	$ (8,571)
Pension benefit obligation
Common stock issued upon exercise of options and warrants, Shares	676
Common stock issued upon exercise of options and warrants	$ 1,125
Repurchase of common stock, Shares	(358)
Repurchase of common stock	$ (1,582)
Stock-based compensation	$ 735
Net income		14,877		14,877
Balance, end of period, Shares at Jun. 30, 2021	23,055
Balance, end of period at Jun. 30, 2021	$ 73,204	83,884	(8,571)	148,517
Balance, beginning of period, Shares at Mar. 31, 2021	22,656
Balance, beginning of period at Mar. 31, 2021	$ 72,877	74,171	(8,571)
Pension benefit obligation
Common stock issued upon exercise of options and warrants, Shares	578
Common stock issued upon exercise of options and warrants	$ 827
Repurchase of common stock, Shares	(179)
Repurchase of common stock	$ (827)
Stock-based compensation	$ 327
Net income		9,713		9,713
Balance, end of period, Shares at Jun. 30, 2021	23,055
Balance, end of period at Jun. 30, 2021	$ 73,204	83,884	(8,571)	148,517
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)	170,207
Pension benefit obligation
Common stock issued upon exercise of options and warrants, Shares	2,895
Common stock issued upon exercise of options and warrants	$ 14,416
Repurchase of common stock, Shares	(2,832)
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)	170,207
Pension benefit obligation
Common stock issued upon exercise of options and warrants, Shares	1,529
Common stock issued upon exercise of options and warrants	$ 8,556
Repurchase of common stock, Shares	(1,614)
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