UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Retained Earnings	Other Comprehensive Income / Loss	Total
Balance at beginning at Dec. 31, 2018	$ 70,273	$ 134,399	$ (7,554)
Balance at beginning (in shares) at Dec. 31, 2018	22,422
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of options and warrants	$ 73
Common stock issued upon exercise of options and warrants (in shares)	78
Repurchase of common stock	$ (1,440)
Repurchase of common stock (in shares)	(366)
Pension benefit obligation				$ 0
Stock-based compensation	$ 638
Net income		1,739		1,739
Balance at end at Mar. 31, 2019	$ 69,544	136,138	(7,554)	198,128
Balance at end (in shares) at Mar. 31, 2019	22,134
Balance at beginning at Dec. 31, 2019		139,805	(8,421)	202,641
Balance at beginning (in shares) at Dec. 31, 2019	22,531
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative change in accounting principle		(92,469)
Common stock issued upon exercise of options and warrants	$ 48
Common stock issued upon exercise of options and warrants (in shares)	28
Repurchase of common stock (in shares)	0
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 end (in shares) at Mar. 31, 2020	22,559