Condensed Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Balance at Dec. 31, 2020	$ 404	$ (16,426)	$ 316,192	$ (3,213)	$ 20,022	$ 6,743	$ (14,648)	$ (19,639)	$ 328,713
Balance, shares at Dec. 31, 2020	40,394						(1,487)
Net loss					(3,138)				(3,138)
Other comprehensive loss						(10,290)			(10,290)
Equity compensation	$ 2		2,635						2,637
Equity compensation, shares	207
Exercise of options			271						271
Exercise of options, shares	19
Employee stock purchase plan	$ 1		589						590
Employee stock purchase plan, shares	37
Redemption and repurchase of stock to cover tax withholdings	$ (1)		(1,812)						(1,813)
Redemption and repurchase of stock to cover tax withholdings, shares	(72)
Balance at Mar. 31, 2021	$ 406		301,449		13,671	(3,547)	$ (14,648)		297,331
Balance, shares at Mar. 31, 2021	40,585						(1,487)
Balance at Dec. 31, 2021	$ 414		322,874		1,975	(9,887)	$ (14,648)		300,728
Balance, shares at Dec. 31, 2021	41,397						(1,487)
Net loss					(3,389)				(3,389)
Other comprehensive loss						(3,775)			(3,775)
Equity compensation	$ 2		3,338						3,340
Equity compensation, shares	205
Exercise of options	$ 2		1,678						1,680
Exercise of options, shares	140
Employee stock purchase plan			638						638
Employee stock purchase plan, shares	37
Redemption and repurchase of stock to cover tax withholdings	$ (1)		(1,729)						(1,730)
Redemption and repurchase of stock to cover tax withholdings, shares	(91)
Balance at Mar. 31, 2022	$ 417		$ 326,799		$ (1,414)	$ (13,662)	$ (14,648)		$ 297,492
Balance, shares at Mar. 31, 2022	41,688						(1,487)