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, 2018	22,422
Common stock issued upon exercise of options and warrants (in shares)	483
Repurchase of common stock (in shares)	(379)
Balance at end (in shares) at Jun. 30, 2019	22,526
Balance at beginning at Dec. 31, 2018	$ 70,273	$ 134,399	$ (7,554)
Common stock issued upon exercise of options and warrants	347
Repurchase of common stock	(1,440)
Cumulative change in accounting principle		0
Balance, beginning of period (as adjusted for change in accounting principle)		134,399
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax			0	$ 0
Stock-based compensation	1,119
Net Income		3,539		3,539
Balance at end at Jun. 30, 2019	$ 70,299	137,938	(7,554)	200,683
Balance at beginning (in shares) at Mar. 31, 2019	22,134
Common stock issued upon exercise of options and warrants (in shares)	405
Repurchase of common stock (in shares)	(13)
Balance at end (in shares) at Jun. 30, 2019	22,526
Balance at beginning at Mar. 31, 2019	$ 69,544	136,138	(7,554)
Common stock issued upon exercise of options and warrants	274
Repurchase of common stock	0
Cumulative change in accounting principle		0
Balance, beginning of period (as adjusted for change in accounting principle)		136,138
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax			0	0
Stock-based compensation	481
Net Income		1,800		1,800
Balance at end at Jun. 30, 2019	$ 70,299	137,938	(7,554)	200,683
Balance at beginning (in shares) at Dec. 31, 2019	22,531
Common stock issued upon exercise of options and warrants (in shares)	256
Repurchase of common stock (in shares)	(72)
Balance at end (in shares) at Jun. 30, 2020	22,715
Balance at beginning at Dec. 31, 2019	$ 71,257	139,805	(8,421)	202,641
Common stock issued upon exercise of options and warrants	452
Repurchase of common stock	(205)
Cumulative change in accounting principle		(92,469)
Balance, beginning of period (as adjusted for change in accounting principle)		47,336
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax			0	0
Stock-based compensation	898
Net Income		13,764		13,764
Balance at end at Jun. 30, 2020	$ 72,402	61,100	(8,421)	125,081
Balance at beginning (in shares) at Mar. 31, 2020	22,559
Common stock issued upon exercise of options and warrants (in shares)	228
Repurchase of common stock (in shares)	(72)
Balance at end (in shares) at Jun. 30, 2020	22,715
Balance at beginning at Mar. 31, 2020	$ 71,792	58,128	(8,421)	0
Common stock issued upon exercise of options and warrants	404
Repurchase of common stock	(205)
Cumulative change in accounting principle		0
Balance, beginning of period (as adjusted for change in accounting principle)		58,128
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax			0	0
Stock-based compensation	411
Net Income		2,972		2,972
Balance at end at Jun. 30, 2020	$ 72,402	$ 61,100	$ (8,421)	$ 125,081