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 at beginning (in shares) at Dec. 31, 2019	22,531
Common stock issued upon exercise of options and warrants (in shares)	28
Repurchase of common stock (in shares)
Balance at end (in shares) at Mar. 31, 2020	22,559
Balance at beginning at Dec. 31, 2019	$ 71,257	$ 139,805	$ (8,421)
Common stock issued upon exercise of options and warrants	48
Repurchase of common stock
Cumulative change in accounting principle		(92,469)
Balance, beginning of period (as adjusted for change in accounting principle)		47,336
Pension benefit obligation				$ 0
Stock-based compensation	487
Net Income		10,792		10,792
Balance at end at Mar. 31, 2020	$ 71,792	58,128	(8,421)	121,499
Balance at beginning (in shares) at Dec. 31, 2020	22,737
Common stock issued upon exercise of options and warrants (in shares)	98
Repurchase of common stock (in shares)	(179)
Balance at end (in shares) at Mar. 31, 2021	22,656
Balance at beginning at Dec. 31, 2020	$ 72,926	69,007	(8,571)	133,362
Common stock issued upon exercise of options and warrants	298
Repurchase of common stock	(755)
Cumulative change in accounting principle
Balance, beginning of period (as adjusted for change in accounting principle)		69,007
Pension benefit obligation				0
Stock-based compensation	408
Net Income		5,164		5,164
Balance at end at Mar. 31, 2021	$ 72,877	$ 74,171	$ (8,571)	$ 138,477