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)
Common stock issued upon exercise of options and warrants, Shares	98
Stock Repurchased During Period, Shares	(179)
Common stock issued upon exercise of options and warrants	$ 298
Repurchase of common stock	(755)
Stock-based compensation	$ 408
Net income		5,164		5,164
Pension benefit obligation
Shares, Outstanding, Ending Balance at Mar. 31, 2021	22,656
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2021	$ 72,877	74,171	(8,571)	138,477
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
Common stock issued upon exercise of options and warrants, Shares	1,366
Stock Repurchased During Period, Shares	(1,218)
Common stock issued upon exercise of options and warrants	$ 5,860
Repurchase of common stock	(14,104)
Stock-based compensation	$ 790
Net income		21,115		21,115
Pension benefit obligation
Shares, Outstanding, Ending Balance at Mar. 31, 2022	21,292
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2022	$ 47,844	$ 137,646	$ (1,622)	$ 183,868