Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2018	$ 385	$ 260,361	$ 34,984	$ (6,072)	$ (14,591)	$ 275,067
Balance, shares at Dec. 31, 2018	38,463				(1,484)
Net loss			(297)			(297)
Foreign currency translation adjustment				(3,781)		(3,781)
Comprehensive loss						(4,078)
Equity compensation	$ 2	1,978				1,980
Equity compensation, shares	205
Exercise of options	$ 1	1,450				1,451
Exercise of options, shares	145
Employee stock purchase plan		578				578
Employee stock purchase plan, shares	25
Redemption and repurchase of stock to cover tax withholdings		(2,376)				(2,376)
Redemption and repurchase of stock to cover tax withholdings, shares	(82)
Balance at Mar. 31, 2019	$ 388	261,991	34,687	(9,853)	$ (14,591)	272,622
Balance, shares at Mar. 31, 2019	38,756				(1,484)
Balance at Dec. 31, 2019	$ 390	271,782	36,704	(8,589)	$ (14,591)	285,696
Balance, shares at Dec. 31, 2019	39,018				(1,484)
Net loss			(6,665)			(6,665)
Foreign currency translation adjustment				(4,463)		(4,463)
Comprehensive loss						(11,128)
Equity compensation	$ 2	2,687				2,689
Equity compensation, shares	208
Exercise of options		376				376
Exercise of options, shares	33
Employee stock purchase plan		688				688
Employee stock purchase plan, shares	30
Redemption and repurchase of stock to cover tax withholdings		(1,712)				(1,712)
Redemption and repurchase of stock to cover tax withholdings, shares	(70)
Balance at Mar. 31, 2020	$ 392	$ 273,821	$ 30,039	$ (13,052)	$ (14,591)	$ 276,609
Balance, shares at Mar. 31, 2020	39,219				(1,484)