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	4,862			4,862
Cumulative effect adjustment | ASU 2018-02 and ASU 2014-09 [Member]	(652)			415	(1,067)
Exercise of stock options	$ 33		33
Exercise of stock options, Shares	8,000	8,000
Restricted stock units issued	$ (121)	$ (2)	(99)	24
Restricted stock units issued, Shares		12,000
Share based compensation earned	1,570		1,570
Share based compensation earned, Shares		19,000
Adjustment for interest rate swap	248				248
Translation (loss) gain	(1,282)				(1,282)
Ending Balance at Jun. 30, 2018	191,227	$ 349	249,674	(47,420)	(11,020)	$ (356)
Ending Balance, Shares at Jun. 30, 2018		34,747,000				(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	7,379			7,379
Cumulative effect adjustment | ASU 2017-12 and ASU 2016-02 [Member]	$ (4,590)			(4,602)	12
Exercise of stock options, Shares	1,000
Restricted stock units issued	$ (337)	$ (3)	(322)	18
Restricted stock units issued, Shares		212,000
Share based compensation earned	1,829		1,829
Share based compensation earned, Shares		14,000
Adjustment for interest rate swap	(506)				(506)
Translation (loss) gain	234				234
Ending Balance at Jun. 30, 2019	$ 182,569	$ 352	$ 252,916	$ (56,668)	$ (13,675)	$ (356)
Ending Balance, Shares at Jun. 30, 2019		35,180,000				(138,000)