Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Loss [Member]	Accumulated Loss [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2018	$ 178,560		$ 349	$ 251,409	$ (59,427)		$ (13,415)		$ (356)
Beginning Balance (ASU 2017-12 [Member]) at Dec. 31, 2018						$ (11)		$ 11
Beginning Balance (ASU 2016-02 [Member]) at Dec. 31, 2018		$ (4,590)				$ (4,590)
Beginning Balance, Shares at Dec. 31, 2018			34,954						(138)
Net income	$ 17,707				17,707
Exercise of stock options and dividend reinvestment issuances, Shares	66		31
Restricted stock units issued	$ (447)		$ 3	(427)	(23)
Restricted stock units issued, Shares			255
Share based compensation earned	2,888		$ 1	2,887
Share based compensation earned, Shares			35
Adjustment for minimum pension liability, net of tax	(184)						(184)
Interest rate swap	(574)						(574)
Translation gain (loss)	(343)						(343)
Ending Balance at Dec. 31, 2019	193,017		$ 353	253,869	(46,344)		(14,505)		$ (356)
Ending Balance, Shares at Dec. 31, 2019			35,275						(138)
Translation loss at Dec. 31, 2018	(7,733)
Interest rate swap adjustment beginning balance at Dec. 31, 2018	563
Minimum pension liability adjustment beginning balance at Dec. 31, 2018	(6,245)
Accumulated other comprehensive loss, beginning balance at Dec. 31, 2018	(13,415)
Cumulative effect adjustment for interest rate swap | ASU 2017-12 [Member]	11
Accumulated other comprehensive loss, cumulative translation adjustment | ASU 2017-12 [Member]	11
Translation (loss) income	(343)						(343)
Accumulated other comprehensive loss, activity	(1,101)
Translation loss, ending balance at Dec. 31, 2019	(8,076)
Minimum pension liability adjustment ending balance at Dec. 31, 2019	(6,429)
Accumulated other comprehensive loss, ending balance at Dec. 31, 2019	(14,505)
Net income	8,172				8,211					$ (39)
Restricted stock units issued	(337)		$ 2	(331)	(8)
Restricted stock units issued, Shares			230
Share based compensation earned	1,758			1,758
Adjustment for minimum pension liability, net of tax	(2,247)						(2,247)
Translation gain (loss)	2,256						2,256
Noncontrolling interest distribution/acquired	(992)									(992)
Ending Balance at Dec. 31, 2020	203,611		$ 355	255,296	(38,141)		(14,496)		$ (356)	953
Ending Balance, Shares at Dec. 31, 2020			35,505						(138)
Translation (loss) income	2,256						2,256
Accumulated other comprehensive loss, activity	9
Translation loss, ending balance at Dec. 31, 2020	(5,820)
Minimum pension liability adjustment ending balance at Dec. 31, 2020	(8,676)
Accumulated other comprehensive loss, ending balance at Dec. 31, 2020	(14,496)
Net income	1,983				1,426					557
Exercise of stock options	$ 13			13
Exercise of stock options and dividend reinvestment issuances, Shares	2		2
Restricted stock units issued	$ (514)		$ 3	(517)
Restricted stock units issued, Shares			263
Share based compensation earned	3,558			3,558
Share based compensation earned, Shares			39
Common stock repurchase and retirement, Amount	(5,013)		$ (8)	(5,361)					$ 356
Common stock repurchase and retirement, Shares			(781)						138
Adjustment for minimum pension liability, net of tax	2,964						2,964
Translation gain (loss)	(538)						(538)
Noncontrolling interest distribution/acquired	(107)									(107)
Ending Balance at Dec. 31, 2021	205,957		$ 350	$ 252,989	$ (36,715)		(12,070)			$ 1,403
Ending Balance, Shares at Dec. 31, 2021			35,028
Translation (loss) income	(538)						$ (538)
Accumulated other comprehensive loss, activity	2,426
Translation loss, ending balance at Dec. 31, 2021	(6,358)
Minimum pension liability adjustment ending balance at Dec. 31, 2021	(5,712)
Accumulated other comprehensive loss, ending balance at Dec. 31, 2021	$ (12,070)