Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Loss [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2018	$ 178,560	$ 349	$ 251,409	$ (59,427)	$ (13,415)	$ (356)
Beginning Balance, Shares at Dec. 31, 2018		34,954				(138)
Net income	1,864			1,864
Cumulative effect adjustment | ASU 2017-12 and ASU 2016-02 [Member]	(4,590)			(4,602)	12
Restricted stock units issued	(8)		(8)
Restricted stock units issued, Shares		12
Share based compensation earned	798		798
Share based compensation earned, Shares		14
Adjustment for interest rate swap	(213)				(213)
Translation gain (loss)	978				978
Ending Balance at Mar. 31, 2019	177,389	$ 349	252,199	(62,165)	(12,638)	$ (356)
Ending Balance, Shares at Mar. 31, 2019		34,980				(138)
Beginning Balance at Dec. 31, 2018	178,560	$ 349	251,409	(59,427)	(13,415)	$ (356)
Beginning Balance, Shares at Dec. 31, 2018		34,954				(138)
Net income	7,379
Translation gain (loss)	234
Ending Balance at Jun. 30, 2019	182,569	$ 352	252,916	(56,668)	(13,675)	$ (356)
Ending Balance, Shares at Jun. 30, 2019		35,180				(138)
Beginning Balance at Mar. 31, 2019	177,389	$ 349	252,199	(62,165)	(12,638)	$ (356)
Beginning Balance, Shares at Mar. 31, 2019		34,980				(138)
Net income	5,515			5,515
Restricted stock units issued	(329)	$ (3)	(314)	18
Restricted stock units issued, Shares		200
Share based compensation earned	1,031		1,031
Adjustment for interest rate swap	(293)				(293)
Translation gain (loss)	(744)				(744)
Ending Balance at Jun. 30, 2019	182,569	$ 352	252,916	(56,668)	(13,675)	$ (356)
Ending Balance, Shares at Jun. 30, 2019		35,180				(138)
Beginning Balance at Dec. 31, 2019	193,017	$ 353	253,869	(46,344)	(14,505)	$ (356)
Beginning Balance, Shares at Dec. 31, 2019		35,275				(138)
Net income	3,412			3,412
Restricted stock units issued	(152)	$ (1)	(153)
Restricted stock units issued, Shares		63
Share based compensation earned	597		597
Translation gain (loss)	(2,268)				(2,268)
Ending Balance at Mar. 31, 2020	194,606	$ 354	254,313	(42,932)	(16,773)	$ (356)
Ending Balance, Shares at Mar. 31, 2020		35,338				(138)
Beginning Balance at Dec. 31, 2019	193,017	$ 353	253,869	(46,344)	(14,505)	$ (356)
Beginning Balance, Shares at Dec. 31, 2019		35,275				(138)
Net income	6,670
Translation gain (loss)	(1,093)
Ending Balance at Jun. 30, 2020	199,042	$ 355	254,323	(39,682)	(15,598)	$ (356)
Ending Balance, Shares at Jun. 30, 2020		35,493				(138)
Beginning Balance at Mar. 31, 2020	194,606	$ 354	254,313	(42,932)	(16,773)	$ (356)
Beginning Balance, Shares at Mar. 31, 2020		35,338				(138)
Net income	3,258			3,258
Restricted stock units issued	(151)	$ (1)	(144)	8
Restricted stock units issued, Shares		155
Share based compensation earned	154		154
Translation gain (loss)	1,175				1,175
Ending Balance at Jun. 30, 2020	$ 199,042	$ 355	$ 254,323	$ (39,682)	$ (15,598)	$ (356)
Ending Balance, Shares at Jun. 30, 2020		35,493				(138)