Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ 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, 2017	$ 186,569	$ 347	$ 248,170	$ (52,673)	$ (8,919)	$ (356)
Beginning Balance, Shares at Dec. 31, 2017		34,708,000				(138,000)
Net income	5,763			5,763
Cumulative effect adjustment | ASU 2018-02 and ASU 2014-09 [Member]	(652)			415	(1,067)
Exercise of stock options	$ 4		4
Exercise of stock options, Shares	2,000	2,000
Restricted stock units issued	$ (22)		(22)
Restricted stock units issued, Shares		12,000
Share based compensation earned	708		708
Share based compensation earned, Shares		19,000
Adjustment for interest rate swap	193				193
Translation gain	2,010				2,010
Ending Balance at Mar. 31, 2018	194,573	$ 347	248,860	(46,495)	(7,783)	$ (356)
Ending Balance, Shares at Mar. 31, 2018		34,741,000				(138,000)
Beginning Balance at Dec. 31, 2018	178,560	$ 349	251,409	(59,427)	(13,415)	$ (356)
Beginning Balance, Shares at Dec. 31, 2018		34,954,000				(138,000)
Net income	1,864			1,864
Cumulative effect adjustment | ASU 2017-12 and ASU 2016-02 [Member]	$ (4,590)			(4,602)	12
Exercise of stock options, Shares	0
Restricted stock units issued	$ (8)		(8)
Restricted stock units issued, Shares		12,000
Share based compensation earned	798		798
Share based compensation earned, Shares		14,000
Adjustment for interest rate swap	(213)				(213)
Translation gain	979				979
Ending Balance at Mar. 31, 2019	$ 177,390	$ 349	$ 252,199	$ (62,165)	$ (12,637)	$ (356)
Ending Balance, Shares at Mar. 31, 2019		34,980,000				(138,000)